EXPULSION ARTICLE I, SECTION 5, OF THE UNITED STATES CONSTITUTION PROVIDES THAT "EACH HOUSE [OF CONGRESS] MAY DETERMINE THE RULES OF ITS PROCEEDINGS, PUNISH ITS MEMBERS FOR DISORDERLY BEHAVIOR, AND, WITH THE CONCURRENCE OF TWO-THIRDS, EXPEL A MEMBER." SINCE 1789, THE SENATE HAS EXPELLED ONLY FIFTEEN OF ITS ENTIRE MEMBERSHIP.