Cleaning house has a nice ring to it until you realize you have to replace some members of the cleaned out house, but who do you trust. Sneaky bastards are all over DC knowing just what to say, and how to say it.
Sometimes it’s best to keep the opposition you know, keep them close, but not close enough for them to sink the knife.
Who says they have to be DC critters. They should have all been outsiders like himself from day one. Just retain a few DC swamp-things as consultants and keep them at arm's length and out of the West Wing.
Better an empty clean house than one full of vermin.