<Tr> <Td> <Ul> <Li> </Li> <Li> </Li> <Li> </Li> </Ul> </Td> </Tr> <Ul> <Li> </Li> <Li> </Li> <Li> </Li> </Ul> <P> The nuclear option is a parliamentary procedure that allows the United States Senate to override a rule or precedent by a simple majority of 51 votes, instead of by a supermajority of 60 votes . The option is invoked by the presiding officer of the body ruling that the validity of a Senate rule or precedent is a constitutional question . The issue is immediately put to the full Senate, which decides by majority vote . The procedure thus allows the Senate to decide any issue by majority vote, regardless of existing procedural rules, such as current Senate rules specifying that ending a filibuster requires the consent of 60 senators (out of 100) for legislation, and 67 for amending a Senate rule . The term "nuclear option" is an analogy to nuclear weapons being the most extreme option in warfare . </P> <P> The nuclear option has only been used in practice twice (in 2013 and 2017), however the threat to use it dates back at least to 1917, in opinions related to reform of the Senate's filibuster rules . Subsequently, an opinion written by Vice President Richard Nixon in 1957 concluded that the U.S. Constitution grants the presiding officer the authority to override existing Senate rules . The option was used to make further rule changes in 1975 . In November 2013, Senate Democrats used the nuclear option to eliminate filibusters on executive branch nominations and federal judicial appointments other than those to the Supreme Court . On April 6, 2017, Senate Republicans used the nuclear option to eliminate the exception for Supreme Court nominees, after the nomination of Neil Gorsuch failed to meet the requirement of 60 votes for ending the debate . </P>

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