不是預算或任命案，不能簡單多數通過，參議院要60票才能通過。如果修憲要參眾兩院各2/3多數通過，再加上3/4州議會通過

In 1917, with frustration mounting and at the urging of President Woodrow Wilson, senators adopted a rule (Senate Rule 22) that allowed the Senate to invoke cloture and limit debate with a two-thirds majority vote. This rule was first put to the test in 1919, when the Senate invoked cloture to end a filibuster against the Treaty of Versailles. Even with the new cloture rule, however, filibusters remained an effective means to block legislation, since a two-thirds vote was difficult to obtain. Over the next four decades, the Senate managed to invoke cloture only five times. Filibusters proved to be particularly useful to southern senators who sought to block civil rights legislation, including anti-lynching bills. Not until 1964 did the Senate successfully overcome a filibuster to pass a major civil rights bill. Nevertheless, a growing group of senators continued to be frustrated with the filibuster and pushed to change the cloture threshold. In 1975, the Senate reduced the number of votes required for cloture from two-thirds of senators voting to three-fifths of all senators duly chosen and sworn, or 60 of the current 100 senators. Today, filibusters remain a part of Senate practice, although only on legislation. The Senate adopted new precedents in the 2010s to allow a simple majority to end debate on nominations.