Senators, Restore Democracy: Repeal Senate Rule 22

The U.S. Constitution, Article I, Section 5 states, “Each House may determine the rules of its proceedings, punish its members for disorderly behavior, and, with the concurrence of two thirds, expel a member.”

Expelling a member is the only constitutionally mandated requirement for the Congress to use more than a simple majority to set its own rules. (Notwithstanding impeachment and amendment, but within the chambers themselves.)