Nancy Pelosi Announces Formal Impeachment Inquiry of Trump

WASHINGTON — Speaker Nancy Pelosi announced on Tuesday that the House would begin a formal impeachment inquiry of President Trump, saying that he had betrayed his oath of office and the nation’s security in seeking to enlist a foreign power for his own political gain.

“The actions taken to date by the president have seriously violated the Constitution,” she said after emerging from a meeting of House Democrats in the basement of the Capitol. Mr. Trump, she said, “must be held accountable — no one is above the law.”

The announcement was a stunning development that unfolded after months of caution by House Democrats, who have been divided over using the ultimate remedy to address what they have called flagrant misconduct by the president. It had the potential to reshape Mr. Trump’s presidency and to cleave an already divided nation only a year before he plans to stand for re-election.

In this case, with an avalanche of Democrats — including many who had resisted the move — now demanding it, Ms. Pelosi said that Mr. Trump’s reported actions, and his administration’s refusal to share details about the matter with Congress, have left the House no alternative outside of impeachment.