Both houses follow the same constitutional path, but their own rules make them work very differently. Article I, Section 5 lets "Each House... determine the Rules of its Proceedings."
| House | Senate | |
|---|---|---|
| Debate | limited; the Rules Committee writes a "rule" for each major bill setting debate time and which amendments are allowed | unlimited unless the Senate votes to end it |
| Ending debate | by majority vote | cloture: three-fifths of senators (60 of 100) for most bills |
| Effect | the majority can pass bills quickly | a minority of 41 can block many bills by filibuster |
Why it works
The filibuster is a product of rules, not of the Constitution. The Senate adopted cloture (Rule XXII) in 1917, requiring two-thirds; in 1975 it lowered the bar to three-fifths of senators. Today a senator rarely needs to talk for hours; the threat of a filibuster is enough, so most major bills need 60 votes. There are exceptions written into law or rules: budget reconciliation bills (under the Congressional Budget Act of 1974) have debate capped at 20 hours and pass by majority, and since 2013 (executive and lower-court nominations) and 2017 (Supreme Court) nominations have needed only a majority to end debate. The debate over the filibuster itself is old. Supporters say it protects the minority, forces compromise and keeps the Senate deliberate; critics say it lets a minority block what a majority wants and makes the Senate less accountable.
Key idea
The House Rules Committee sets limits on debate and amendments; in the Senate, debate is unlimited unless 60 senators vote for cloture, so a minority can block many bills by filibuster. Reconciliation and nominations have special majority rules.
Worked example: Count to cloture
A bill has 57 supporters and 43 opponents in the Senate. Opponents filibuster. Can the bill pass?
- Cloture needs 60.
- 57 is three short, so debate cannot be ended and the bill stalls, unless it qualifies for reconciliation or supporters change the rules.
Answer: Not under the regular rules.
Worked example: Which rule applies?
The Senate is voting on a nominee for a federal appeals court. How many votes are needed to end debate?
- Since 2013, cloture on executive and lower-court nominations takes a simple majority.
Answer: A simple majority.
Common mistake
Thinking the filibuster is in the Constitution. It comes from Senate rules, which the Senate can change (and did, in 1917, 1975, 2013 and 2017). Check: the Constitution sets supermajorities only for overrides, treaties, amendments, convictions and expulsions; 60 appears nowhere in it.