Is there a union for Federal employees like those at the DOJ? Can the Trump-era people just be summarily terminated without cause? Of course, such evil people as those working for JoeHo could fabricate anything they wanted to get the results they wanted.
These are appointees. They serve ‘at the pleasure of the President’ - though they are a sort of hybrid since they have a tradition of being much less connected to politics than other appointees, or did before Clinton did a mass purge and then had his cronies be part of the chain reporting to him about the progress of cases against him and his. The Dems just try to turn it into a scandal any time the Republicans fire any.