This is how it works.
His first set of people were, to an extent, normal.
It's the second and third sets that are dangerous. He is filling them one at a time with loyalists.
As bad as Reince Priebus and John Kelly were, they had an independent idea of their duty to the US. They were replaced by a classic sycophant in Mulvaney.
As bad as Sessions was as AG, he wasn't willing to undermine the rule of law. Then we got Barr.
The spotlight now points towards the FBI again: Trump wants a loyalist. If he keeps adding his people into the structure, at some point it will be entirely rotten and Trump will be able to use the state as a vengeance machine.
The House needs to act asap. Because this is happening.