Also leaving were two other National Security Council aides as well as officials at the Justice and Commerce Departments. Gabriel Noronha, a Trump appointee who worked on Iran issues at the State Department official, was fired after tweeting that the president was “entirely unfit to remain in office.”

“The events of yesterday made my position no longer tenable,” Mr. Goodspeed said in a brief interview. On CNBC, Mr. Mulvaney said, “I can’t stay here, not after yesterday.”

Mr. Mulvaney went further, suggesting Mr. Trump had become increasingly unhinged in recent months. “Clearly he is not the same as he was eight months ago and certainly the people advising him are not the same as they were eight months ago and that leads to a dangerous sort of combination, as you saw yesterday,” he said.

Former Attorney General William P. Barr, perhaps the president’s most important defender until stepping down last month after a falling out, denounced Mr. Trump. In a statement to The Associated Press, Mr. Barr said that the president’s actions were a “betrayal of his office and supporters” and that “orchestrating a mob to pressure Congress is inexcusable.”

Even one of Mr. Trump’s lawyers in his bid to reverse the election results in Pennsylvania, Jerome M. Marcus, broke with him on Thursday, filing a motion withdrawing because “the client has used the lawyer’s services to perpetrate a crime and the client insists upon taking action that the lawyer considers repugnant and with which the lawyer has a fundamental disagreement.”

But concern about the exodus grew among some Republicans and Democrats, who feared what Mr. Trump could do without anyone around him. And some said they were worried about destabilizing the United States in a dangerous world, urging Secretary of State Mike Pompeo; Robert C. O’Brien, the national security adviser; and John Ratcliffe, the director of national intelligence, among others, to stay.

“I understand the high emotions here,” former Secretary of State Condoleezza Rice said in an interview, “but I hope that the national security team will stay in place because it’s important to send a signal to our adversaries that the United States is prepared and functioning and they shouldn’t try to take advantage at this time.”

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