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A cloture vote is a procedural vote in the U.S. Senate used to end a filibuster and limit debate. It allows a bill, nomination, or other measure to proceed to a final vote. Invoking cloture generally requires a three-fifths supermajority (60 votes) in the Senate, though exceptions exist for some nominations and legislation. The vote to invoke cloture occurs two calendar days after the motion is filed and, if successful, typically sets a 30-hour limit for further debate before the final vote. Three observations: First, the cloture vote process is not in the Constitution. The U.S. Senate adopted its first cloture rule in 1917 (Rule 22). That rule required a two-thirds vote to end debate in the Senate. The rule change came about largely due to a filibuster led by a small group of anti-war senators, notably Senators Robert La Follette and George W. Norris, both liberal Republicans, who opposed arming merchant marine ships at the start of WWI. Rule 22 was further modified in 1975, lowering the threshold for most legislation to three-fifths (60 votes). Cloture is not the law of the land — it’s a rule in the Senate.