...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.
Or perhaps he breached the peace?
One wonder why Rand Paul did not know that.
TSA reports to no mortal, that is the problem.