If Barr can figure it out Sessions has no excuse.
Sessions couldn’t investigate himself as AG. Had to recuse.
Barr isn’t in this situation although the Deep State will try to create a court case involving Barr and then demand that he, too, recuse. You’ve probably seen the demands that he be removed from office immediately. We’ll see if they can fake a court case - Comey is not around to do what he did to Jeff Sessions so it will be harder for the deep state this round.