What role does the vice president serve in the legislative branch

Senators must be 30 years of age, U.S. citizens for at least nine years, and residents of the state they represent. The Vice President of the United States serves as President of the Senate and may cast the decisive vote in the event of a tie in the Senate.

The Vice President of the United States can serve as the President of the Senate. The Vice President can also have the tie breaking vote in such an event.