Really good question, or if they slow roll it claiming they need more time for whatever reason. The DOJ has been acting like an independent government for a long time now and if they don’t comply, then Trump really needs to send in the Marines.
I’ve read that there is an LEO tactic called “freeze & seize”. One LEO assigned to each perp. They break in, yell “freeze”, direct hands be in full view and begin to systematically remove every bit of evidence. Used in corporate cases, or so I gather.
First things first.
If the DOJ doesn't comply then of course Trump can fire them.