WASHINGTON — President Trump used the power of his office to try to get Ukraine to interfere in the 2020 election to investigate a political rival, according to an explosive whistle-blower complaint released on Thursday after days of damning revelations about Mr. Trump’s dealings with Ukraine.

Attorney General William P. Barr and the president’s personal attorney Rudolph W. Giuliani were central to the effort, the complaint said.

The House Permanent Select Committee on Intelligence released the complaint on Thursday.

Members of the House and Senate intelligence committees and a group of senior lawmakers from both parties, including Senator Mitch McConnell, the majority leader, were permitted to review the classified complaint on Wednesday, just hours after the White House released a reconstructed transcript of a July 25 call between Mr. Trump and President Volodymyr Zelensky of Ukraine. During the call, about the country’s need for more American financial aid, Mr. Trump urged Mr. Zelensky to pursue an investigation into a political rival, former Vice President Joseph R. Biden Jr.

The unclassified version was released ahead of a House Intelligence Committee hearing where the acting director of National Intelligence, Joseph Maguire is scheduled to testify. The Office of the Director of National Intelligence provided lawmakers with an unclassified version of the whistle-blower complaint so that it could be discussed in the open hearing.

The intelligence chief is on Capitol Hill Thursday.

Though the reconstructed transcript of the call has been released, the complaint, filed in August by an intelligence official, contains more details than the phone call, including the names of White House officials who may have witnessed presidential misconduct and other actions.

House Democrats have said that Mr. Trump violated his oath of office when he pressured a foreign leader to investigate one of his political rivals. The White House initially refused to provide Congress with the complaint or to reveal what was said on the call. After Democrats took the first steps to impeach Mr. Trump, the administration disclosed details of the call and shared the classified complaint with lawmakers.

The allegations it contained were “deeply disturbing” and “very credible,” Representative Adam B. Schiff, Democrat of California and the chairman of the Intelligence Committee, said Wednesday after reviewing the complaint.

Mr. Trump has dismissed the allegations that he acted improperly. Early Thursday morning, the president was busy sharing on Twitter praise from some of his allies and issued his own view:

Most Republican lawmakers and allies of the president did not break with Mr. Trump after the contents of the July 25 phone conversation were made public.

“If you are underwhelmed by this transcript, you are not alone or ‘crazy,’” Senator Lindsey Graham, Republican of South Carolina, said in a Twitter post on Wednesday. Mr. Graham served as a House prosecutor during the impeachment trial of President Bill Clinton in 1999. “Those willing to impeach the president over this transcript have shown their hatred for @realDonaldTrump overrides reason.”

Mr. Graham is not a member of the Senate Intelligence Committee and would not have been among the lawmakers permitted to see the full classified complaint on Wednesday.

Nicholas Fandos contributed reporting.

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