Rep. Mark Meadows officially resigned from Congress on Monday, more than three weeks after he was chosen to be President Donald Trump's new chief of staff.
The resignation was effective at 5 p.m. Monday, and he will start his new role Tuesday, his spokesman said.
"Serving the people of North Carolina's eleventh congressional district for these last seven years has been the honor of my life," Meadows wrote in a resignation letter. "I will forever be grateful for the opportunity."
Trump has said Mulvaney will become the U.S. special envoy for Northern Ireland.
Meadows, who is considered one of Trump's staunchest congressional allies, was a founding member of the House Freedom Caucus.