The seismic shake-up capped another rollercoaster week in the West Wing, rocked by the public clash between Priebus and new White House communications director Anthony Scaramucci. The latter's hiring prompted press secretary Sean Spicer to resign in protest one week ago and immediately touched off speculation that Priebus could be next.
White House sources confirmed to Fox News that Priebus, the former Republican National Committee chairman, resigned secretly on Thursday.
Trump made the announcement publicly on Twitter late Friday afternoon. "I am pleased to inform you that I have just named General/Secretary John F Kelly as White House Chief of Staff. He is a Great American ... and a Great Leader. John has also done a spectacular job at Homeland Security. He has been a true star of my Administration," he tweeted.