The feckless lickspittle human filth who infest Our Congress may only be subject to arrest, apprehension (military term) or detention when they are not "on the Floor of the House or Senate".  That means, in practical terms, as soon as either body of Congress is officially out of session, they may be taken into custody by The US Marshals or by Military Police (acting under Article 132b of the UCMJ).  The scum, can then be dragged by their heels to the nearest place of confinement, adjudged guilty and hanged or shot, forthwith.  NB: Fort McNair is the closest place AND is surrounded by 19th Century brick walls, 12 feet thick and 24 feet high.  Excellent backstop for a fusillade of .30 caliber bullets (full metal jacket in accordance with The Geneva Convention, of course.)  Alternatively they could be hanged there as were the Lincoln conspirators in 1865.  Unfortunately, where the 1865 scaffold built for six, the Officers' Clubs stands now, or maybe the NCO Club.  BTW the rope used to hang the Conspirators was cut into 1-foot lengths and sold as souvenirs.  Ahhh, eBay bids perhaps for the fired brass from This Time Around?