Looks like congress remains "in session" during a shutdown.
https://cooper.house.gov/media-center/press-releases/effects-of-government-shutdown
Any Lawfags? I read this as they can be arrested pretty much anytime except when in actual session (at the capitol) but even then they can be arrested for Treason, et al….
Article I, Section 6 of the Constitution provides, in part: “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.”
The first sentence quoted above gives Representatives and Senators limited immunity from arrest for some offenses while Congress is in session. It does not grant them immunity from indictment and subsequent prosecution, however.