<Tr> <Td> <Ul> <Li> </Li> <Li> </Li> <Li> </Li> </Ul> </Td> </Tr> <Ul> <Li> </Li> <Li> </Li> <Li> </Li> </Ul> <P> The Vice President of the United States is the ex officio President of the Senate, as provided in Article I, Section 3, Clause 4, of the United States Constitution, but may only vote in order to break a tie . According to the U.S. Senate, as of February 28, 2018, a tie - breaking vote had been cast 264 times by 36 vice presidents . </P> <P> The following is the list of tie - breaking votes cast by vice presidents of the United States . </P>

Who has the power to cast a tie-breaking vote in the senate