WASHINGTON — Speaker Nancy Pelosi on Friday said that Attorney General William P. Barr had “gone rogue,” and questioned whether he could objectively make decisions about legal action in response to an explosive whistle-blower complaint accusing President Trump of misconduct, because Mr. Barr himself was mentioned in the document.

“I do think the attorney general has gone rogue,” Ms. Pelosi said on CNN. “He has for a long time now. And since he was mentioned in all of this, it’s curious that he would be making decisions about how the complaint would be handled.”

Earlier Friday on MSNBC’s Morning Joe, Ms. Pelosi accused the White House of “a cover-up of the cover-up,” referring to the July 25 phone call between Mr. Trump and President Volodymyr Zelensky of Ukraine in which Mr. Trump pressured Mr. Zelensky to investigate a political opponent, and the ensuing effort to keep the call from going public. The White House released a reconstructed transcript of the call this week, and on Thursday, the House Intelligence Committee released an unclassified version of the whistle-blower’s complaint.

Ms. Pelosi announced the start of an impeachment inquiry before the release of the reconstructed transcript and complaint.