Originally posted by the Voice of America. Voice of America content is produced by the Voice of America, a United States federal government-sponsored entity, and is in the public domain. Former Trump Aide Quits Diplomatic Post After Capitol Mayhem VOA News Former White House Chief of Staff Mick Mulvaney says he is quitting his diplomatic position, adding to a growing list of resignations from the Trump administration following Wednesday's deadly invasion of the U.S. Capitol building by supporters of President Donald Trump. Mulvaney announced Thursday he is resigning as special envoy to Northern Ireland and said other administration officials have considered stepping down. "I can't do it. I can't stay," Mulvaney said on CNBC. "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 came after hundreds of Trump supporters broke into the Capitol as legislators were in the process of certifying Electoral College votes in the November election, formalizing President-elect Joe Biden's win. The president had urged his supporters to march on the building at a rally, asserting the election was stolen and saying, "You'll never take back our country with weakness. You have to show strength and you have to be strong." Four people died in the chaos, according to the Metropolitan Police Department in Washington. Mulvaney, also a former Office of Management and Budget director, said he informed Secretary of State Mike Pompeo of his resignation Wednesday night. Shortly after Mulvaney's announcement, the Commerce Department's deputy assistant secretary for intelligence and security, John Costello, said the violence also prompted him to step down. "Yesterday's events were an unprecedented attack on the very core of our democracy -- incited by a sitting President," Costello said on Twitter. "The President has long disregarded and diminished the rule of law and the constitution. Yesterday, that culminated in violent sedition against the U.S. Congress for the purposes of overturning a legally recognized and valid election." A leading developer of Trump's China policy, Matt Pottinger, announced his resignation on Wednesday. A senior administration official said Pottinger stepped down in response to Trump's reaction to the mob of protesters at the Capitol. National Security Advisor Robert O'Brien, Pottinger's boss, asked Pottinger to remain in the position to facilitate the transition to the new Biden administration but the official said Pottinger had "completed those tasks." .