WASHINGTON — Reince Priebus, the White House chief of staff who failed to impose order on a chaos-wracked West Wing, was pushed out on Friday after a stormy six-month tenure, and President Trump replaced him with John F. Kelly, the secretary of homeland security and retired four-star Marine general.

Mr. Trump announced Mr. Kelly’s appointment on Twitter shortly before 5 p.m. and only afterward sent out another message thanking Mr. Priebus for his service. “We accomplished a lot together and I am proud of him!” Mr. Trump wrote.
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