AP® United States Government and Politics · Unit 2 · Topic 2.2
How a Bill Becomes a Law
A bill becomes law only after surviving committee review and a floor vote in both the House and Senate, reconciling any differences between the two versions, and either getting the president's signature or ten days of presidential inaction while Congress is in session.
A bill starts when a member of Congress introduces it, and it gets sent to a committee that handles that subject area. That committee can hold hearings, amend it, or simply never schedule a vote on it, which is where most bills die quietly. If it clears committee, it goes to the full chamber for debate and a vote. Then the same process has to happen all over again in the other chamber: another committee, another possible burial, another floor vote. Because a bill needs to survive committee and a floor vote in both the House and the Senate, there are at least four separate points where a small group of people, or even one committee chair, can stop it cold without ever casting a recorded vote against it.
Surviving both chambers is not the finish line. The House and Senate almost never pass identical text on the first try, since each chamber can amend bills independently. When the two versions differ, neither becomes law until the differences are resolved, usually by a conference committee made up of members from both chambers who negotiate a single compromise text. That compromise then has to go back through both chambers again and pass in identical form before it is eligible to reach the president's desk.
Once identical text reaches the president, three things can happen: a signature makes it law, a veto sends it back to Congress (which can override with two-thirds votes in both chambers), or the president can simply do nothing. Ten days of inaction while Congress is in session lets the bill become law anyway. This whole gauntlet of committees, chambers, and the executive is why Unit 2's theme of veto points matters: the Constitution deliberately scattered the power to stop legislation across many hands.
Key terms
- Committee referral
- The step where a bill is assigned to the committee that handles its subject area, where most bills are never scheduled for a vote.
- Conference committee
- A temporary joint committee of House and Senate members formed to reconcile differing versions of the same bill into one text.
- Veto
- The president's rejection of a bill, which sends it back to Congress and requires a two-thirds vote in both chambers to override.
- Pocket veto
- A bill dies automatically if the president does not sign it and Congress adjourns within the ten-day period, instead of becoming law by default.
Watch it explained
- How it worksWalk me through a bill's whole journey from introduction to the president's signature.
- How it worksHow many separate points along that path can kill a bill, and who controls each one?
- Worked exampleTrace one bill that clears the House, stalls in a Senate committee, and never returns.
- Common mistakeWhy isn't passing both chambers enough when the two versions of the text differ?
- Going furtherWhat happens to a bill when the president neither signs it nor vetoes it for ten days?
Check yourself
End of topic.