Rush Limbaugh said this last week, regarding Omarosa Manigault:

Like I say, the staffing decisions, some of them, have just puzzled me amazingly.

There is no reason to be puzzled. President Trump explained it on Twitter:

https://twitter.com/realDonaldTrump/status/1028996374174593025

https://twitter.com/realDonaldTrump/status/1029002242932834310

This is really simple. If you stroke the President's ego by praising him, he thinks you are a great person. If not, you are a bad person.