Ms. Pelosi was the most prominent voice in a growing chorus of Democrats, and a few Republicans, who surveyed the aftermath of Wednesday’s historic events and concluded Mr. Trump was too dangerous to remain in office until Jan. 20, when Mr. Biden is set to be sworn in.
Representative Adam Kinzinger, Republican of Illinois, had issued a similar call earlier on Thursday, posting on Twitter that the president had become “unmoored not just from his duty or from his oath but from reality itself.”
His statement followed similar ones by Representatives Charlie Crist and Ted Lieu on Wednesday and a letter signed by 17 Democratic members of the House Judiciary Committee was sent to Mr. Pence calling to invoke the 25th Amendment.
Gov. Larry Hogan, Republican of Maryland, echoed those calls on Thursday, saying, “I think there’s no question that America would be better off if the president would resign or be removed from office.”
Andrew Bates, a spokesman for the Biden transition, did not take a stand on the 25th Amendment or impeachment.
“President-elect Biden and Vice President-elect Harris are focused on their duty — preparing to take office on Jan. 20 — and will leave it to Vice President Pence, the cabinet and the Congress to act as they see fit,” Mr. Bates said. “In the meantime, Donald Trump must stop blocking cooperation with the transition that could harm the readiness of the United States government to overcome the pandemic and the other crises he has worsened.”
On Thursday morning, a Washington-based law firm, Crowell & Moring, which represents a number of Fortune 500 companies, added its voice to the growing chorus of civic and business leaders calling for the president’s removal. In asking other lawyers to join, the firm said that “when it comes to defending our Constitution and our system of laws, we have a special duty and an exceptional perspective.”