Most of Congress's real work happens in committees. Each bill is referred to a relevant committee — such as the Judiciary Committee or the Appropriations Committee — where members hold hearings, propose amendments, and vote on whether to send the bill to the full chamber for a floor vote. Committees also conduct oversight of executive agencies and hold confirmation hearings for presidential nominees.
How members are assigned
Committee assignments are controlled by each party, not by the full chamber. At the start of each Congress, the Republican and Democratic caucuses run separate processes to fill their allocated seats on every committee.
In the House, each party has a Steering Committee — a group of senior members and leadership — that reviews requests and makes assignments. Members submit preference lists ranking the committees they want to serve on. Steering weighs factors like seniority, home-state relevance, prior experience, and loyalty to leadership. Assignments are then ratified by the full party caucus and formally approved by a floor vote.
In the Senate, the process is similar but smaller in scale. Party steering committees allocate seats, with senior senators generally having first pick. Senate rules limit how many major committees a senator can serve on (typically two), which gives each senator more leverage over their assignments than House members typically have.
Seniority and chair positions
The majority party controls all committee chairmanships. Within the majority, the chair is almost always the member with the longest continuous service on that committee — this is the seniority rule. The most senior minority-party member becomes the Ranking Member, acting as the minority's lead voice on the committee.
Leadership can bypass seniority when appointing chairs, and has done so to reward allies or remove members deemed insufficiently loyal, but this is the exception rather than the rule.
The most powerful committees
A handful of committees carry outsized influence. In the House, the Rules Committee controls the terms of floor debate for every bill. The Appropriations Committee writes all government spending bills. The Ways and Means Committee writes tax legislation. In the Senate, the Finance Committee handles taxes and entitlements, and the Armed Services and Foreign Relations committees shape national security policy. Seats on these committees are highly sought after.
Types of committees
Not all committees are created equal — they differ in permanence and purpose.
Standing committees
Permanent bodies established by House and Senate rules at the start of each Congress. These are the committees with real legislative power — they receive bill referrals, hold hearings, and vote on whether to advance legislation. There are currently 20 standing committees in the House and 16 in the Senate. While the structure can be reshuffled by a rules change at the start of a new Congress, the core lineup has been stable for decades.
Select and special committees
Created for a specific purpose and dissolved when that work is done. Examples include the January 6th Select Committee and the Select Committee on the Chinese Communist Party. They typically cannot report legislation — their role is to investigate and produce reports.
Joint committees
Include members from both chambers. Most are permanent administrative bodies — the Joint Committee on Taxation and the Joint Committee on the Library, for example — rather than legislative ones. They do not advance bills to a floor vote.
Conference committees
Temporary, formed only when the House and Senate pass different versions of the same bill. Members from both chambers negotiate a unified text, which must then be approved by both chambers again. Once the bill is resolved, the conference committee dissolves. Each one is unique to that bill.
