U.S. ConstitutionArticle I — The Legislative BranchSubarticle 3Section 4
The Vice President of the United States shall be President of the Senate, but shall have no Vote, unless they be equally divided.
Use as reference
Lexinter.net | U.S. Const. art. I, § 3, cl. 4 | https://laws.lexinter.net/constitution/us/article-1/section-3/clause-4