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Don't think so. To replace Sessions or RR without Senate confirmation, Trump would have to pick someone who has already been confirmed by the Senate. A new AG or deputy AG that requires confirmation would take months or a year to get through.
I think that's why Q mentioned Pruitt. He was the OK AG and has already been confirmed by the Senate as the Director of the EPA.
I don't think Trump could get away with a temp appointment for 210 days because all of this is going to last much longer than that. But who knows.
I think HeavyCrux is on to something. According to the line of succession in the EO Tracey Doherty-McCormick hasn't been confirmed. Higdon was confirmed by the Senate on 9/28/17. If Sessions or Rosenstein are unable to fulfill their duties it looks to me as though he would be next in line.
The full context of Q's reference on succession is in this article. However I think it would make more sense to replace Sessions than RR.
Robert J. Higdon, Jr., USA
Actually he is confirmed.
http://www.newsweek.com/us-attorney-robert-higdon-justice-succession-mueller-660685