Woodrow Wilson wrote in 1885 that Congress in session is Congress on public exhibition, while Congress in its committee rooms is Congress at work. The observation still holds. With thousands of bills introduced each Congress and a federal government of enormous scope, committees let members specialize, develop expertise, and filter legislation before it reaches the floor.
This guide explains the types of committees, the most influential panels, how hearings and markups work, how committees oversee agencies, and how seats and chairs are assigned.
Party ratios on committees generally track each party's share of the chamber, though the House Rules Committee has nine majority members and four minority members. Party steering committees assign members to committees, weighing seniority, regional balance, and loyalty. Chairs control hearings, staff, and agendas, and ranking members lead the minority side. House Republicans limit chairs to three consecutive terms.
Committees divide the workload by subject. When a bill is introduced, it is referred to the committee with jurisdiction, and most bills never advance beyond that step. The Legislative Reorganization Act of 1946 consolidated dozens of overlapping committees into a smaller set with defined jurisdictions and professional staff, the basic structure that remains today. Committees hold hearings to gather testimony and markups to amend and vote on bills.
Every committee oversees the agencies within its jurisdiction, and some specialize in it. The House Oversight Committee and the Senate Homeland Security and Governmental Affairs Committee can investigate across the government, and the intelligence committees oversee secret programs. Committees request documents, hold hearings, and can issue subpoenas, and refusing a subpoena can lead to a contempt citation by the full chamber.
Standing committees are permanent and handle most legislation. Select and special committees are created for specific purposes, such as investigations or studying an issue, and some, like the intelligence committees, have become permanent in all but name. Joint committees, such as the Joint Committee on Taxation, include members of both chambers and mainly do research or housekeeping. Conference committees are temporary panels that reconcile differing House and Senate bills. The House Rules Committee is unique, setting the terms of debate for nearly every major bill.
Many observers note that power has shifted from committees to party leaders, who increasingly write major bills, bypass committees, or negotiate final deals directly. Conference committees, once routine, are now rare. Supporters of strong committees say they build expertise and allow bipartisan problem-solving, while defenders of leadership control say it is necessary to pass bills in a polarized Congress.
Some committees are especially sought after. The appropriations committees write the annual spending bills. Ways and Means in the House and Finance in the Senate write tax law and oversee Social Security, Medicare, and trade. The armed services committees write the annual defense authorization, one of the few major bills that passes every year. The Senate Judiciary Committee handles judicial nominations, and the foreign affairs and foreign relations committees oversee diplomacy and treaties.
See how committees fit into the whole in how Congress works, follow a bill through committee in how a bill becomes law, or explore oversight in how Congress investigates.