Question

who can use the casting vote in case of a tie?

Answer 1

the Speaker of the British House of Commons and the President of the United States Senate 

Answer 2

According to the US Constitution

The Vice President of the United States shall be President of the Senate, but shall have no Vote, unless they be equally divided" (U.S. Constitution, Article I, section 3). Since 1789, 258 tie-breaking votes have been cast.

Hope it helps u....