'I can't stay': Mick Mulvaney resigns as Trump's envoy to Northern Ireland

President Donald Trump’s former acting chief of staff and current special envoy to Northern Ireland Mick Mulvaney on Thursday said he has resigned from his post after pro-Trump rioters stormed the Capitol.

“I called [Secretary of State] Mike Pompeo last night to let him know I would be resigning from that. I just can’t do it. I can’t stay,” Mulvaney said in an interview with CNBC.

“It’s a nothing thing, it doesn’t affect the outcome, it doesn’t affect the transition, but it’s what I’ve got, and it’s a position I really enjoy doing, but you can’t do it,” he added.

Mulvaney said he has spoken with other friends in the administration and expected others to leave in the next day or two.

“Those who choose to stay, and I have talked with a couple of them, are choosing to stay because they’re concerned the president might put someone in to replace them that could make things even worse,” Mulvaney said.

On Wednesday, Melania Trump's chief of staff, Stephanie Grisham, a former White House press secretary, left her post, as did deputy press secretary Sarah Matthews. Social secretary Rickie Niceta stepped down as well, a source familiar with the matter told NBC News.

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Mulvaney became Trump's acting chief of staff in late 2018 after the president announced that John Kelly was resigning. Trump replaced Mulvaney in March, appointing then-U.S. Rep. Mark Meadows, R-N.C., in his place. Mulvaney has also previously served as a U.S. representative from South Carolina and director of Trump's Office of Management and Budget.

“I can’t stay here, not after yesterday," he said in the interview Thursday. "You can’t look at that yesterday and think I want to be a part of that."