Different factions within the white house pushing different people and different agendas. Lots of people have the president's ear, and he often agrees with the last person he spoke to on a given issue.

Prebius and Spicer didn't wan't Scarramuci in. For a while that worked, but then Ivanka and Jared convinced Trump to bring the Mooch in. Mooch comes in, Spicer leaves. A few days later Prebius is pushed out.

Trump needs new Chief of Staff, picks Gen Kelly. Kelly says he will take the job but Scaramucci has to go, Trump says whatevs and around and around we go.