Can't arrest congressmen when congress is in session. They won't be in session in August. Also it's much less obvious to arrest them quietly using US Marshals at their separate/scattered locations.

U.S. Constitution Article I, Section 6, Clause 1: The Senators and Representatives...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.

Well, California is burning so there's that.

Hi congressman "insert treasonous assholes name here" we're with the US Marshall's office. We'd like to ask you a few questions, please step into our black unmarked van for an interview.

Can’t wait

I've been watching these shit stains get away with it since 1964. Seeing their mug shots will be a joy. I hope it actually happens. And it seems like now, while Trump is not in office, is the time for it.