I know he has no “powers”. Congress doesn’t, either, really, except when it comes to budget. Their existence is a multi-act theatrical production.
LOL, but not totally LOL:
If Congress itself does not have much of a force to arrest the AG, then perhaps Congress should put out a marque on the AG, and let someone else (Bounty Hunter?) handle getting the AG into his cell.
U.S. Constitution, Article I, Sec. 8 cl. 11:
The Congress shall have Power ... To declare War, grant Letters of Marque and Reprisal, and make Rules concerning Captures on Land and Water;