Committees: where Congress actually happens
The answer
The House and Senate together run scores of committees and subcommittees, and almost everything that becomes law passes through one first. A committee chair decides whether a bill gets a hearing at all, and most never do. They die by inaction rather than by a vote. This single gatekeeping power, not the floor vote most people picture, is where the large majority of introduced bills never get a hearing.1
How it actually works
A bill is referred to the committee with jurisdiction over its subject, often forwarded to a subcommittee first. The subcommittee can hold hearings, where members and outside witnesses testify, mostly to build a public record and signal priorities rather than to persuade. If the subcommittee chair chooses to advance the bill, it holds a markup, a session where members offer and vote on amendments line by line. A subcommittee markup produces a recommendation, not a final product. Only a full committee vote to report a bill sends it to the floor.2
Example: the House Judiciary Committee's markup process for immigration-related bills in 2025 repeatedly stalled at the subcommittee stage when chairs declined to schedule further action, a pattern CRS documents as routine rather than exceptional. Committees also conduct oversight hearings unconnected to any specific bill, using subpoena power to compel testimony and documents from agencies, a separate but related function.
Who holds the power
Committee and subcommittee chairs control the calendar: whether a bill gets a hearing, when a markup happens, and what amendments are in order. Committee assignments and chairmanships are decided by each party's steering committee, tied closely to seniority and leadership loyalty. Ranking members, the minority's senior member on a committee, can request hearings but cannot compel them.
House and Senate committees differ somewhat in markup procedure. The House Rules Committee shapes floor amendments after committee passage, while the Senate has no equivalent gatekeeper, though individual senators can still block floor time.3 Conference committees, a separate temporary body, reconcile House and Senate versions of the same bill after both chambers pass different texts.
Where you come in
See the guides on how to contact your member of Congress about a committee assignment and how to reach committee staff to ask about a hearing or markup schedule.
Related
Glossary: markup, ranking member, conference committee
See also the explainer on how a bill really becomes law.