Senate Floor Procedure

Unlike the House, the Senate has no general rule limiting debate, so any senator may speak as long as he or she holds the floor, and most business moves only when senators agree. In 1917, after a filibuster blocked a bill to arm merchant ships, the Senate adopted Rule XXII, allowing a supermajority to end debate through cloture, and in 1975 it lowered the threshold from two-thirds of those voting to three-fifths of all senators, usually 60 votes. Since 1937 the majority leader has had the right to be recognized first, which gives the leader control over what comes to the floor.

To take up a bill, the majority leader usually moves to proceed to it, a motion that can itself be debated and filibustered, and then cloture may be needed again on the bill. After cloture is invoked, debate is limited to 30 more hours. Senators may generally offer amendments on any subject unless the majority leader fills the amendment tree, using the leader's priority recognition to occupy all available amendment slots. Most actual scheduling is done through unanimous consent agreements that set the terms for debate and votes, and nominations and budget reconciliation bills follow special rules.

By majority vote the Senate eliminated the filibuster for most nominations in 2013 and for Supreme Court nominations in 2017, and in September 2025 it allowed groups of sub-cabinet nominees to be confirmed together, but the 60-vote threshold for most legislation remains. Supporters of the Senate's rules say they force compromise and protect the minority, while critics say the routine use of the filibuster has made the Senate a supermajority body that blocks bills with majority support. The rules can be changed by a two-thirds vote, or reinterpreted by a simple majority through the so-called nuclear option.