The RATs made replacing staff difficult by delaying appointments in the Senate. They maximized the time it took to push them through .
Trump could have fired all 3,000 Obama appointees on his first day in office.
If the Senate rejected or slow walked Trump's appointees, so what?
Just leave every job vacant.
If the senior department bureaucrats need a decision or a signature, tell them to drive over to the Oval Office and explain the problem.