Article I, §5, clause 2: “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.”
It does not apply in this circumstance according to legal expert on Rush .
I had a meeting so I missed the entire segment ..
I have not researched this, but as a lawyer my immediate reaction is that the disorderly behavior must occur while a senator in order for expulsion to be an option.