President Donald Trump’s former chief of staff and current special envoy to Northern Ireland, Mick Mulvaney, has resigned.

He told CNBC in an interview this morning that he called Secretary of State Mike Pompeo last night and resigned.

"I called Mike Pompeo last night to let him know I was resigning from that. I can’t do it. I can’t stay," Mulvaney said in the interview.

He added: "Those who choose to stay, and I have talked with some of them, are choosing to stay because they’re worried the President might put someone worse in."

Mulvaney's resignation follows the departure of at least two other Trump loyalists. Stephanie Grisham, the former White House communications director and press secretary and current chief of staff for first lady Melania Trump, submitted her resignation Wednesday afternoon, as did President Trump's deputy national security adviser Matt Pottinger.