Congress is worse than Executive for oversight. Unless they are their own independent branch, which wouldn't work at all in our system, it has to be Judiciary. Nominate the AG from [somewhere] and appointed by the SCOTUS. Not sure where the other appointees would come from. It's an issue of admin law atm, but obviously that would change. I can't recall offhand where the career level Asst/Deputy AG's end and the political appointees begin.