Those government employees that serve at the pleasure of the President can be hired and fired at will. However, those employees that don't serve at the pleasure of the President cannot be fired without cause. Trump's only option is to warn them that if they screw up, they will be fired and if the offense is illegal, they will be prosecuted. You can bet that the schmuck that started the latest fake news will pay dearly. Trump isn't going to run around the room chasing the fly. He will bide his time and when the fly exposes himself, WHAM!!!! Down comes the fly swatter.