<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 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>
who has the power to cast a tie-breaking vote in the senate
who has the power to cast a tie-breaking vote in the senate
The Vice President of the United States
The Vice President of the United States