The President, and the entire executive branch has to have trust that political operatives are not trying to undermine their ability to do their jobs for political goals. That's true no matter who is in the White House. It's just not possible or practical to purge the entire Intelligence Community every time the administration changes hands. But as politics has creeped into the inner workings of our most delicate aspects of government, that will become an increasingly likely action to take.
The Democrats are really overplaying their hand on this one. They have shown that they have fully politicized our intelligence operations, which could cause severe harm for a very long time.
It has become clear over the past three years that both the Intelligence Communiity and the FBI have and continue to act as Democratic Party operatives and that the agencies operate politically.
Unless these agencies are razed to the ground, eliminated in their entirety, with all staff removed permanently and not allowed to re-enter any federal employment, the United States of America will not survive, except possibly as a totalitarian regime.