The F.B.I. director, James B. Comey, asked the Justice Department this weekend to publicly reject President Trump’s assertion that President Barack Obama ordered the tapping of Mr. Trump’s phones, senior American officials said on Sunday. Mr. Comey has argued that the highly charged claim is false and must be corrected, they said, but the department has not released any such statement.
Mr. Comey, who made the request on Saturday after Mr. Trump leveled his allegation on Twitter, has been working to get the Justice Department to knock down the claim because it falsely insinuates that the F.B.I. broke the law, the officials said.
A spokesman for the F.B.I. declined to comment. Sarah Isgur Flores, the spokeswoman for the Justice Department, also declined to comment.
Mr. Comey’s request is a remarkable rebuke of a sitting president, putting the nation’s top law enforcement official in the position of questioning Mr. Trump’s truthfulness. The confrontation underscores the high stakes of what the president and his aides have unleashed by accusing the former president of a conspiracy to undermine Mr. Trump’s young administration.
The White House showed no indication that it would back down from Mr. Trump’s claims. On Sunday, the president demanded a congressional inquiry into whether Mr. Obama had abused the power of federal law enforcement agencies before the 2016 presidential election. In a statement from his spokesman, Mr. Trump called “reports” about the wiretapping “very troubling” and said that Congress should examine them as part of its investigations into Russia’s meddling in the election.
Along with concerns about potential attacks on the bureau’s credibility, senior F.B.I. officials are said to be worried that the notion of a court-approved wiretap will raise the public’s expectations that the federal authorities have significant evidence implicating the Trump campaign in colluding with Russia’s efforts to disrupt the presidential election.
One problem Mr. Comey has faced is that there are few senior politically appointed officials at the Justice Department who can make the decision to release a statement, the officials said. Attorney General Jeff Sessions recused himself on Thursday from all matters related to the federal investigation into connections between Mr. Trump, his associates and Russia.
Mr. Comey’s behind-the-scenes maneuvering is certain to invite contrasts to his actions last year, when he spoke publicly about the Hillary Clinton email case and disregarded Justice Department entreaties not to.
In his demand for a congressional inquiry, the president, through his press secretary, Sean Spicer, issued a statement on Sunday that said, “President Donald J. Trump is requesting that as part of their investigation into Russian activity, the congressional intelligence committees exercise their oversight authority to determine whether executive branch investigative powers were abused in 2016.”