He will fire/eliminate all non productive departments and people.
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I hope you are right. I am confident that he will want to do so, but I hope he can fight against all of those who will be attacking him for doing so. It will be a mighty, mighty army of bureaucrats, lobbyists, and politicians who don’t want the gravy train to end.
I predict that he feckless congress that can't seem to find any authority to quell the current dictators scrapping of the Constitution will suddenly rediscover those lost powers. Count on it.