Barr has an impossible task. Near everybody inside the DOJ building hates Trump with a white hot passion and has the green light from the Uniparty to obstruct. FOIA will grind to halt as the Deep State tries to punt everything over the November 2020 goal line.
Trump can have them fired. One by one. He would have fired over 900 if he fired one a day. The cost of suits by those fired would be less than all the money spent on Meuller and impeachment. Ask any Bean Counter!