They are when Congress is in session, aren’t they?
Not for felonies.
They are when Congress is in session, aren’t they?
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Even then, not exempt from felonies, there are specifics. I’ll look:
https://www.law.cornell.edu/constitution-conan/article-1/section-6/clause-1
Clause 1. The Senators and Representatives shall receive a Compensation for their Services, to be ascertained by Law, and paid out of the Treasury of the United States. They shall in all Cases, except Treason, Felony and Breach of the Peace, be privileged from Arrest during their Attendance at the Session of their respective Houses and in going to and returning from the same; and for any Speech or Debate in either House, they shall not be questioned in any other Place.