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.
Read more about expulsion and see a list of expulsion cases.
Learn more about expulsions by reading these essays and a book profile from the Senate Historical Office.
Interested in related materials? Take a look at this Virtual Reference Desk subject for more information.