Notes · PoliticsUK · A-Levels

US Congress

Congress is the bicameral federal legislature of the United States, comprising the House of Representatives and the Senate, with powers of legislation, the purse, oversight and (for the Senate) confirmation and treaty ratification. This topic examines its structure, powers, models of representation, legislative process, and the debate over its effectiveness amid gridlock and partisanship.

5 sections~21 min reading time3 competenciesLevel Foundation 1 · Standard 3 · Advanced 1

T·141414 / 18

Exam profile

AO1 · Demonstrate knowledge of the structure, powers, functions and legislative process of CongressAO2 · Analyse how Congress makes law, represents and checks the executive, and why it often gridlocksAO3 · Evaluate the effectiveness and representativeness of Congress, reaching a substantiated judgement

Operators:explain and analyseevaluateto what extentanalyse and evaluate this statementexamine

basic level

AS-Level expects the structure and main powers of the two chambers and the outline of the legislative process.

higher level

The full A-Level requires sustained evaluation of the effectiveness and representativeness of Congress, reaching a judgement.

Depth

Text

Contents · 5 sections

US Congress

The structure of Congress: House and Senate#

FoundationAQA 7152/2: US CongressDfE GCE Politics subject content

The House of Representatives versus the Senate

Fig. 1Both chambers legislate and must agree; they differ in size, term, constituency and their distinct powers.

Congress is the legislative branch of the US federal government, and it is bicameral - it has two chambers, the House of Representatives and the Senate - designed by the framers to represent the people and the states respectively and to check one another. The bicameral structure was itself a compromise (the 'Connecticut Compromise') between large and small states: the House represents population, the Senate represents the states equally. Understanding the composition and distinct character of each chamber is the basis for analysing how Congress works, because the two chambers differ in size, term, constituency and powers, and this shapes everything they do.

The House of Representatives has 435 voting members, apportioned among the states by population, so that more populous states have more Representatives. Members serve two-year terms, meaning the whole House faces election every two years, which keeps Representatives closely tied to their local districts and to shifts in public opinion. Each Representative serves a single congressional district. The short term and local constituency make the House the more responsive, locally-focused and (some argue) more partisan chamber, quick to reflect changes in the popular mood.

The Senate has 100 members, two from each of the fifty states regardless of population, so that every state has equal representation - a small state has the same Senate weight as a large one. Senators serve six-year terms, with about a third elected every two years, giving the Senate greater continuity and insulation from short-term swings than the House. Each Senator represents an entire state. The longer term, state-wide constituency and equal representation make the Senate the more deliberative, prestigious and nationally-oriented chamber, and its distinctive procedures (notably the filibuster) give individual Senators and minorities considerable power.

The two chambers are broadly co-equal in the legislative process - a bill must pass BOTH in identical form to become law - but they have some distinct powers, which a good answer notes. The House has the sole power to initiate revenue (tax) bills and to bring impeachment charges. The Senate has the sole power to try impeachments, to confirm presidential appointments (to the executive and judiciary), and to ratify treaties (by a two-thirds majority) - powers that give it a special role in checking the President. The differences in size, term, constituency and powers mean the two chambers have distinct characters and roles, and comparing them is a common exam task and the foundation for analysing Congress's functions and effectiveness.

Worked example

Why the Senate is the more powerful chamber in checking the President

Explain why the Senate is often regarded as more powerful than the House in checking the executive.

Confirmation
The Senate confirms presidential appointments to the executive and judiciary, giving it a decisive check on who serves in and shapes those branches.
Treaty ratification
The Senate must ratify treaties by a two-thirds majority, so it can block the President's foreign agreements.
Impeachment trial
The Senate tries impeachments (the House brings charges) and can remove the President or judges - the ultimate check.
Longer term and prestige
Six-year terms, state-wide constituencies and the filibuster give Senators independence and leverage over the executive.

Result: The Senate checks the executive more powerfully than the House because it alone confirms appointments, ratifies treaties, and tries impeachments, and its longer terms and distinctive procedures give Senators the independence to use these powers against the President.

Typical mistakes

Muddling the chambers' distinct powers - the House initiates revenue and impeaches; the Senate confirms, ratifies treaties and tries impeachments.
Getting the terms wrong - House two years, Senate six years - or forgetting the Senate's equal state representation.

Active revision

Explain and analyse three differences between the House of Representatives and the Senate. (9 marks)

Active recall

Recall the key points — then reveal.

Sources: GCE AS and A level subject content for politics (Department for Education)

The powers of Congress#

StandardAQA 7152/2: US CongressDfE GCE Politics subject content

The powers of Congress

Fig. 2Congress's powers - legislation, the purse, oversight, confirmation, override and impeachment - are genuinely its own under the separation of powers.

Congress possesses substantial powers, and a strong answer groups them by function rather than listing them. Its primary power is legislative: Congress alone makes federal law, and no bill becomes law without passing both chambers - a power that, under the separation of powers, is genuinely its own, unlike a UK Parliament dominated by the executive. Its enumerated legislative powers include regulating interstate and foreign commerce, and the broad 'necessary and proper' clause has been used to extend its reach; Congress can also propose constitutional amendments. Because the President cannot make law, Congress's legislative power is a real and independent source of authority.

Congress's second great power is the 'power of the purse' - control over federal taxation and spending. All revenue and appropriations must be authorised by Congress, so the executive cannot raise or spend money without congressional approval. This gives Congress a powerful lever over the whole of government and over the President's programme: it can fund, curtail or refuse to fund policies, and disputes over the budget can shut down the federal government. The power of the purse is one of the most effective checks Congress has on the executive, and a recurring source of conflict between the branches.

Congress's third major function is oversight - scrutinising the executive branch and holding it to account. Through committee hearings and investigations, the power to summon officials and documents, and its control over funding and appointments, Congress monitors how the executive implements the law and spends money, exposes wrongdoing, and influences policy. Oversight is exercised largely through the committee system, and it gives Congress a continuous check on the administration. The Senate's specific powers of confirmation (of appointments) and treaty ratification are further, potent checks on the executive, allowing it to block the President's nominees and foreign agreements.

The ultimate congressional powers are constitutional and disciplinary. Congress can override a presidential veto (by a two-thirds majority in both chambers), so the President's veto is a strong but not absolute check. It can impeach and remove the President, other executive officers and federal judges (the House impeaches, the Senate tries), the gravest check of all. And it plays a role in the amendment process and in the counting of electoral votes. A good answer explains these powers - legislative, the purse, oversight, confirmation/ratification, veto override and impeachment - and notes that, because of the separation of powers, they are genuinely Congress's own and make it a far more powerful and independent legislature than the UK Parliament, a point developed in the effectiveness debate and in the comparative topic.

Worked example

How the power of the purse checks the President

Explain how Congress's power of the purse acts as a check on the executive.

The power
All federal taxation and spending must be authorised by Congress - the executive cannot raise or spend money without its approval.
Leverage over policy
Congress can fund, reduce or refuse to fund the President's programmes, so it can advance or block executive policy through the budget.
The ultimate sanction
Disagreement over appropriations can lead to a failure to fund the government - a 'shutdown' - giving Congress powerful leverage.
The limit
The President can veto spending bills and shape the budget through negotiation, so the power operates through bargaining, not command.

Result: The power of the purse lets Congress fund, curtail or block executive policy and even force a shutdown, making it one of Congress's most effective checks on the President - though it operates through bargaining, since the President can veto spending bills in turn.

Typical mistakes

Understating Congress's power by treating it like the executive-dominated UK Parliament - the separation of powers makes it far more independent.
Forgetting the power of the purse or the Senate's confirmation/ratification powers, which are among its most effective checks.

Active revision

Explain and analyse three powers of Congress. (9 marks)

Active recall

Recall the key points — then reveal.

Sources: AQA AS and A-level Politics (7152) specification (AQA)

Representation: delegate, trustee and partisan models#

StandardAQA 7152/2: US CongressDfE GCE Politics subject content

Models of representation in Congress

Fig. 3Members balance the delegate (constituency), trustee (judgement) and partisan (party) models, amid pressure from groups and the President.

Representation is one of Congress's core functions, and members of Congress face competing pressures on how they should represent, captured by several models of representation that a strong answer can name and apply. The delegate model holds that a representative should act as a delegate - faithfully carrying out the expressed wishes of their constituents, voting as their district or state would want, and subordinating their own judgement to the views of those who elected them. On this view the representative is a mouthpiece for the constituency, and members who follow local opinion closely - encouraged by short terms and the need for re-election - are acting as delegates.

The trustee model, by contrast, holds that a representative should act as a trustee - using their own judgement, expertise and conscience to decide what is best, even if this differs from the immediate wishes of their constituents, because voters elect a representative to exercise judgement on their behalf, not merely to relay opinion. On this view the representative owes constituents their considered judgement rather than blind obedience. Members balance these two models constantly: local, salient issues tend to pull them towards the delegate role, while complex or national issues may allow more of the trustee role.

A third model, especially important in the modern, polarised Congress, is the partisan model: that members increasingly vote according to the position of their political party, so that party, rather than constituency opinion or personal judgement, is the strongest predictor of how a member votes. The rise of partisanship and ideological sorting has made party loyalty a powerful force, so that on many issues members vote as their party requires - a significant shift from an earlier era of weaker party discipline. This model reflects the reality that party has become a dominant influence on congressional behaviour.

Other factors also shape how members vote, and a full answer weighs them. Constituency remains powerful because members must be re-elected - they attend closely to local interests, secure federal spending and projects for their district ('pork'), and provide services to constituents. Pressure groups and Political Action Committees influence members through campaign funding, lobbying and mobilising voters. The President seeks to persuade members of his party (and others) to support his programme. Members' own beliefs and the demands of party leadership all play a part. Evaluating Congress's representative function means recognising these competing pressures - constituency (delegate), judgement (trustee), party (partisan), pressure groups, the President - and assessing which dominates, and how well Congress represents. The strongest answers note that partisanship has grown at the expense of the trustee and even the delegate roles, and can weigh whether this makes Congress more or less representative of the people it serves.

Worked example

Applying the models to a members' dilemma

A member's party supports a bill their district opposes. Explain how the models of representation frame the choice.

The delegate pull
As a delegate, the member should follow the district's wishes and vote against the bill, to represent constituents and protect re-election.
The trustee option
As a trustee, the member might use their own judgement to support the bill if they believe it right, trusting voters to accept their considered decision.
The partisan pressure
As a partisan, the member faces strong pressure from party leadership and the risk of a primary challenge to vote with the party.
The likely outcome
In the modern polarised Congress, partisanship often prevails - but a member in a competitive district may follow the delegate model to survive re-election.

Result: The models frame the dilemma as a conflict between following the district (delegate), exercising judgement (trustee) and obeying the party (partisan); in today's polarised Congress the partisan pull is usually strongest, though a member in a marginal district may act as a delegate to secure re-election.

Typical mistakes

Confusing the delegate model (follow constituents' wishes) with the trustee model (use own judgement).
Ignoring the modern dominance of the partisan model and the influence of pressure groups and PACs.

Active revision

Explain and analyse three factors that influence how members of Congress vote. (9 marks)

Active recall

Recall the key points — then reveal.

Sources: GCE AS and A level subject content for politics (Department for Education)

The legislative process and why bills fail#

StandardAQA 7152/2: US CongressDfE GCE Politics subject content

The legislative process in Congress

Fig. 4A bill must clear committee, both chambers (including the Senate filibuster), reconciliation and the President - many veto-points, so most bills fail.

The legislative process in Congress is complex and full of obstacles, which is why most bills fail, and knowing its stages allows a precise analysis of where legislation is blocked. A bill is introduced in one (or both) chambers and referred to a standing committee, which is the crucial early gatekeeper: committees examine, amend and often 'kill' bills, and a bill that a committee does not report out is usually dead. If reported, the bill goes to the floor for debate and a vote; in the House, the Rules Committee controls the terms of debate, while in the Senate debate is more open and subject to the filibuster. The bill must pass the chamber, and then repeat the entire process in the other chamber.

Because a bill must pass both chambers in IDENTICAL form, differences between the House and Senate versions must be reconciled - typically in a conference committee (or through amendments passing between the chambers) - and the reconciled version must then be approved by both. Only then does the bill go to the President, who can sign it into law or veto it; a vetoed bill returns to Congress, which can override the veto only by a two-thirds majority in both chambers, which is hard to achieve. The bill must clear every one of these hurdles, and failure at any stage - in committee, on the floor, in reconciliation, or at the veto - kills it.

The Senate filibuster is a distinctive and important obstacle that a good answer explains. Because Senate rules traditionally allow unlimited debate, a minority (or even a single Senator) can 'filibuster' - prolonging debate to block a vote - and ending a filibuster requires 'cloture', which needs a supermajority (60 of 100 Senators for most legislation). This means that, in practice, most significant legislation needs 60 votes in the Senate rather than a simple majority, giving the minority party great power to block bills and making the Senate a formidable veto-point. The filibuster is a major reason major legislation stalls even when one party controls both chambers and the presidency.

The result of this obstacle course is that the great majority of bills introduced never become law, and analysing WHY is the pay-off. Legislation can be blocked by hostile committees, by the House Rules Committee, by the Senate filibuster, by disagreement between the chambers, by a presidential veto that cannot be overridden, and by the sheer number of veto-points at which a determined minority can obstruct. The separation of powers and bicameralism, combined with the filibuster and the committee system, create so many places to block a bill that legislating is genuinely difficult, especially under divided government or with narrow majorities. This 'gridlock-prone' design is central to evaluating Congress's effectiveness - it protects against hasty or majoritarian legislation but can also paralyse government, the trade-off the effectiveness debate weighs.

Worked example

Tracing where bills die

Identify the main points at which a bill can be blocked in Congress.

Committee
A standing committee can refuse to report a bill, killing it before it reaches the floor - the most common graveyard for legislation.
The Senate filibuster
A minority can filibuster; overcoming it needs 60 votes for cloture, so most major bills need a supermajority in the Senate.
Bicameral disagreement
The bill must pass both chambers in identical form; failure to reconcile House and Senate versions kills it.
The presidential veto
The President can veto the bill, and Congress can override only with a two-thirds majority in both chambers - rarely achieved.

Result: A bill can be blocked in committee, by a Senate filibuster (needing 60 votes for cloture), by failure to reconcile the two chambers, or by a presidential veto that cannot be overridden - so many veto-points that most bills fail, especially under divided government.

Typical mistakes

Thinking a bill needs only a simple Senate majority - most significant legislation needs 60 votes to overcome a filibuster.
Underestimating the committee stage - committees are the key gatekeepers where most bills die.

Active revision

Explain and analyse three reasons why most bills introduced in Congress fail to become law. (9 marks)

Active recall

Recall the key points — then reveal.

Sources: AQA AS and A-level Politics (7152) specification (AQA)

How effective is Congress? Gridlock and partisanship#

AdvancedAQA 7152/2: US CongressDfE GCE Politics subject content

Congress: power versus gridlock

Fig. 5Congress is a powerful, independent legislature, but veto-points, the filibuster and partisanship make it prone to gridlock.

The central evaluative question is how effective Congress is at performing its functions - legislation, representation and oversight - and a strong answer weighs its genuine power against the forces that paralyse it. On the positive side, Congress is a genuinely powerful legislature, far more independent of the executive than the UK Parliament: because of the separation of powers, it makes its own law, controls the purse, and checks the President through oversight, confirmation and the threat of impeachment. Its committee system produces detailed scrutiny and expertise, and its members represent a vast, diverse country. Where the branches can cooperate, Congress can legislate substantially and check the executive effectively - it is not a rubber stamp but an independent centre of power.

Against this, the most serious charge is gridlock - the frequent inability of Congress to pass legislation or to act decisively, so that government stalls. Gridlock has several causes that a good answer explains. The separation of powers and bicameralism create multiple veto-points; the Senate filibuster means most significant legislation needs 60 votes; and, above all, rising partisanship and polarisation mean the two parties increasingly refuse to cooperate. Under divided government (when different parties control Congress and the presidency, or the two chambers), agreement becomes very hard, and even under unified government narrow majorities and the filibuster can block action. The result is that Congress is often unable to address major problems, budgets stall or trigger shutdowns, and important legislation dies.

Partisanship and its effects deserve particular emphasis because they have transformed Congress. The two parties have become more ideologically distinct and internally cohesive, and the incentives of the modern system (safe seats produced partly by gerrymandering, the threat of primary challenges from the party base, partisan media) reward loyalty and punish compromise. As a result, cross-party cooperation - once more common - has become rarer, and Congress increasingly divides on party lines. This has made the partisan model of representation dominant and has intensified gridlock, so that Congress can appear less a deliberative body seeking the national interest than an arena of party warfare. Some see this as a failure of the institution; others note that sharp party choice can clarify accountability.

Reaching a judgement means weighing Congress's real power against its gridlock-prone design and its partisanship, and recognising the trade-off built into the system. Congress is, in constitutional terms, one of the most powerful legislatures in the world - independent, well-resourced and armed with formidable checks on the executive - so in that sense it is highly effective. Yet the same fragmented design, combined with modern polarisation, makes it frequently unable to legislate or to act decisively, so in the sense of getting things done it can be highly ineffective. The strongest answers argue that Congress's effectiveness depends on circumstances (unified vs divided government, the size of majorities, the intensity of partisanship) and on which function one measures (it remains a powerful check on the executive even when it cannot legislate), and reach a judgement - for example that Congress remains a genuinely powerful and independent legislature whose capacity to legislate has been increasingly paralysed by polarisation and the filibuster, so that it is effective as a check but increasingly ineffective as a law-maker. This differentiated, circumstance-sensitive judgement is what distinguishes a top-band answer.

Worked example

Model essay plan: is Congress an ineffective legislature?

Plan a 25-mark answer evaluating whether Congress is an ineffective legislature.

Introduction and thesis
Distinguish effectiveness as a CHECK from effectiveness as a LAW-MAKER; signal a judgement - powerful as a check, increasingly paralysed as a legislator.
The effective case
Under the separation of powers Congress makes its own law, controls the purse, oversees the executive and checks the President - a genuinely powerful, independent legislature with strong committees.
The ineffective case
Gridlock from many veto-points, the Senate filibuster (60 votes) and rising partisanship; divided government and narrow majorities block action; shutdowns and stalled budgets.
The circumstance factor
Effectiveness depends on unified vs divided government, the size of majorities and the intensity of partisanship - and on which function is measured.
Judgement
Conclude that Congress remains a powerful, independent legislature and an effective CHECK on the executive, but that polarisation and the filibuster have made it increasingly ineffective as a LAW-MAKER - a differentiated verdict.

Result: A top-band plan distinguishes Congress's effectiveness as a check (high - independent, armed with strong powers) from its effectiveness as a law-maker (increasingly low - paralysed by veto-points, the filibuster and partisanship), ties the verdict to unified vs divided government, and concludes that Congress is a powerful check but an increasingly gridlocked legislator.

Typical mistakes

Concluding flatly that Congress is 'weak' - it is a genuinely powerful, independent legislature, especially as a check on the executive.
Ignoring the role of partisanship and the filibuster in producing gridlock, or failing to tie the judgement to unified vs divided government.

Active revision

'Congress is an ineffective legislature.' Analyse and evaluate this statement. (25 marks)

Active recall

Recall the key points — then reveal.

Sources: GCE AS and A level subject content for politics (Department for Education)

References & sources

Sources

Department for Education

GCE AS and A level subject content for politics

AQA

AQA AS and A-level Politics (7152) specification

US Congress

5 sections~21 min reading time3 competenciesLevel Foundation 1 · Standard 3 · Advanced 1

US Congress

Key points

Why the Senate is the more powerful chamber in checking the President

Key points

How the power of the purse checks the President

Key points

Applying the models to a members' dilemma

Key points

Tracing where bills die

Key points

Model essay plan: is Congress an ineffective legislature?

Sources

US Congress

Key points

Why the Senate is the more powerful chamber in checking the President

Key points

How the power of the purse checks the President

Key points

Applying the models to a members' dilemma

Key points

Tracing where bills die

Key points

Model essay plan: is Congress an ineffective legislature?

Sources