Priebus was successful in helping Trump win the election, however didn't have the skillsets to 'drain the swamp' within the whitehouse leakers. There Still exists Obama hold-overs that need to be identified, removed then indicted . Mooch will create havoc. 

Winning an election and maintaining order/control in the whitehouse are two different scenarios.

Notice how the tide is turning and illegal Clinton server, Blumenthal / agent for Clinton investigation, comey antics are surfacing and getting addressed with special councils ?

The swamp must drain until you see the catfish& crayfish remaining.