A filibuster is an effort to delay or prevent action on a matter before the United States Senate. It does not always involve one senator giving an endless speech. Modern filibusters often work through procedural resistance and the knowledge that leaders lack enough votes to end debate.
Why people call it the 60-vote rule
Most legislation can pass the Senate with a simple majority once it reaches a final vote. The obstacle is getting to that vote.
Under Senate Rule XXII, ending debate on ordinary legislation usually requires three-fifths of senators “duly chosen and sworn.” In a fully seated 100-member Senate, that means 60 votes. The procedure for limiting debate is called cloture.
This is why a proposal supported by 51 senators may still stall: the majority can support passage but lack the 60 votes needed to overcome a filibuster.
What happens after cloture?
Cloture places limits on further debate and amendments; it does not necessarily produce an immediate final vote. Senate time can still be consumed after cloture depending on the matter and current rules.
The final passage threshold remains separate. Many bills need only a majority for passage, while treaties, veto overrides, constitutional amendments and other actions have different constitutional requirements.
Major exceptions
Some budget-related bills can move through reconciliation, a special process that limits debate and can allow passage by a simple majority. Reconciliation is restricted by budget rules and cannot be used for every policy change.
Senate precedents have also changed the cloture threshold for executive and judicial nominations. A simple majority can now end debate on nominations, including Supreme Court nominations.
Can the filibuster be abolished?
The Senate can change how its rules are interpreted through a majority-backed precedent, often called the “nuclear option.” That is politically significant because a rule change benefiting today's majority could later benefit the opposing party.
Is a government shutdown caused by the filibuster?
Not automatically. Shutdowns occur when funding authority expires. Senate procedure can affect whether a funding bill advances, but disagreement between the House, Senate and president can also cause an impasse.
The US Senate's official history explains how cloture evolved from a two-thirds requirement to today's three-fifths standard for ordinary legislation. Browse more clear reporting and analysis in Politics and World.
