President Trump on Friday announced that Rep. Mark Meadows (R-N.C.) would replace Mick Mulvaney as his chief of staff, becoming the fourth person to hold the position during Trump’s tenure.

The president announced the news in a tweet, saying he would appoint Mulvaney as U.S. special envoy for Northern Ireland.

“I am pleased to announce that Congressman Mark Meadows will become White House Chief of Staff. I have long known and worked with Mark, and the relationship is a very good one,” Trump tweeted Friday night while in Palm Beach, Fla., for fundraising events after a day of official travel.

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“I want to thank Acting Chief Mick Mulvaney for having served the Administration so well. He will become the United States Special Envoy for Northern Ireland. Thank you!” Trump wrote.

Mulvaney was informed of the change earlier Friday, an administration official told The Hill.

The aide spent just over one year on the job, though he never shook the “acting” tag from his title.

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