Business Insider reports that Mick Mulvaney, President Trump's former chief of staff, told CNBC on Thursday that he resigned.
Mulvaney who was serving as special envoy to Northern Ireland, said "I can't do it.
I can't stay." His decision comes after pro-Trump mobs staged an attack on the Capitol, which postponed the certification of Joe Biden's election victory.
Mulvaney is the latest in a string of officials who have resigned since Wednesday's event.
