3.2.1.2 - Congress - Structure, Representation and Committees

Bicameral Congress

Congress is the federal legislature of the United States. In the US Constitution, Congress is not fused with the executive in the UK parliamentary sense. It sits in a separate legislative branch.

The two chambers differ in their basis of representation:

This design comes from Article I of the Constitution. Legislative power is vested in a Congress made up of a Senate and a House of Representatives. The Constitution Annotated explains that the Great Compromise placed proportional representation in one chamber and equal state representation in the other. That is the starting point for almost every AQA point about Congress: the two chambers do not represent America in the same way.

Bicameralism is not just a description of two rooms. It is a constitutional check inside the legislature. The House and Senate are elected on different cycles, represent different constituencies and use different rules. This means a national majority in the House may not translate into the same balance in the Senate, and a bill or political strategy can face different pressures in each chamber.

Students often make one UK-shaped mistake: they treat congressional majorities as if they automatically create the government. They do not. A House or Senate majority can shape leadership, committees and the legislative agenda, but it does not choose the President and it cannot remove the President through a no-confidence vote. Congress is powerful because it is a separate branch, not because it forms the executive.

The House has 435 voting seats; the Senate has 100 seats, two for each state.

House Representation and Leadership

The House of Representatives is designed to be the more immediately responsive chamber. Each voting representative serves a specific congressional district and is elected for a two-year term. House.gov states that the number of voting representatives is fixed by law at no more than 435 and that representation among the 50 states is proportional to population.

The House therefore represents people through districts. A large state has more House seats than a small state because it has more people. After the census, seats are apportioned among the states, and states draw district boundaries. The House History glossary defines apportionment as allocating House seats in proportion to state populations after the census. This is why the House is often called the "people's House", although that phrase should not hide the role of district boundaries, party labels and turnout.

There are also non-voting members. House.gov lists delegates for the District of Columbia, the Virgin Islands, Guam, American Samoa and the Northern Mariana Islands, and a resident commissioner for Puerto Rico. They can perform many House functions, but they cannot vote when the House is meeting as the House of Representatives. This matters for representation because not everyone under US jurisdiction has the same voting representation in Congress.

House representation has three main features:

Leadership organizes this large chamber. The Speaker is elected by the whole House and is the chamber's presiding and administrative head as well as the leader of the majority party in the House. On the 2026 access date, House.gov listed Rep. Mike Johnson as Speaker, Rep. Steve Scalise as Republican Majority Leader and Rep. Tom Emmer as Majority Whip. It also listed Rep. Hakeem Jeffries as Democratic Leader, Rep. Katherine Clark as Democratic Whip and Rep. Pete Aguilar as Democratic Caucus Chair.

The Speaker's role matters because the House is majoritarian and tightly organized. The majority leader helps plan the legislative agenda and schedule business. Whips communicate leadership priorities, count votes and build party support. Current evidence shows why this is politically delicate: the Clerk's Official List of Members dated 1 May 2026 listed 217 Republicans, 212 Democrats, 1 Independent and 5 vacancies, with a whole number of the House of 430. In a narrow House, a small number of members can make leadership much harder.

Active reading: Why does a two-year term make House representatives more responsive, but also potentially more pressured?

Senate Representation and Leadership

The Senate represents states equally. Every state has two senators, regardless of population. California and Wyoming therefore have the same number of senators even though their populations are very different. This is not an accident or a flaw in arithmetic; it is the federal logic of the Senate.

Senators serve six-year terms. The Senate is divided into three classes, and about one third of senators face election or reelection every two years. Senate.gov listed the current cycle in the 119th Congress as Class I terms expiring in 2031, Class II in 2027 and Class III in 2029. This means the Senate is never completely re-elected at once.

The Senate's representative role has three main features:

Originally, the Constitution provided for senators to be chosen by state legislatures. The Seventeenth Amendment changed this by establishing direct election of senators by the people. That makes modern senators democratically elected, but the Senate still does not represent citizens equally by population. It represents states equally and voters within those states directly.

Current party evidence is useful, but keep it in proportion. On the 2026 access date, Senate.gov listed the 119th Congress party division as 53 Republicans, 45 Democrats and 2 Independents. That shows Republican control of the chamber, but it does not change the basic structure: 100 senators, two per state, six-year staggered terms.

Senate leadership differs from House leadership. The Senate has constitutionally mandated officers, including the Vice President as President of the Senate and a President pro tempore. On the access date, Senate.gov listed Vice President J.D. Vance and President Pro Tempore Chuck Grassley. Party leaders do the practical work of party organization: John Thune was listed as Senate Majority Leader, John Barrasso as Majority Whip, Charles E. Schumer as Democratic Leader and Richard J. Durbin as Democratic Whip.

Active reading: Why can the Senate be democratically elected but still less population-equal than the House?

Elections, Terms and Incentives

Congress works in two-year periods. The Office of the Clerk explains that a new Congress begins at noon on January 3 of each odd-numbered year following a general election, unless Congress sets a different day by law. Each Congress lasts for two years, normally divided into two sessions. The 119th Congress began in January 2025 and was in its second session in 2026.

This two-year congressional cycle interacts with different chamber terms: