Maybe Trump is waiting until the House convenes to impeach him to make his move. It would make sense. Move in while they're all in one place, and cant go anywhere. The 10th mountain is already in DC. I guess it would depend on who the police and other troops are loyal to, or maybe the arrest will just involve a fight between traitors and patriots.

Edit: privilege from arrest doesnt apply to felonies. ARTICLE I, SECTION 6, CLAUSE 1 The Senators and Representatives...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....