Quote:

Didn't Clinton fire *all* of them at one point to put in his people?


Each and every incoming administration (assuming it's a different party from it's predecessor) will "fire" all the department heads and top political appointments. More accurately, they resign on the previous President's last day in office. As Willie said, the USAs are political appointees, confirmable by the Senate. So in that sense, Clinton did nothing unusual.
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"When you're up to your ass in alligators, it's hard to remember that you set out to drain the swamp" -- HST