US Deputy Attorney General Rod Rosenstein has denied a report that he discussed invoking a constitutional clause to oust President Donald Trump.
America's second most senior law official said the allegation was "inaccurate and factually incorrect".
The New York Times, citing anonymous sources, also said Mr Rosenstein had suggested secretly recording Mr Trump to expose chaos in the White House.
But a source told the BBC that the comment was sarcastic.
Mr Rosenstein is reported to have made the remarks after Mr Trump fired the FBI director last year.
James Comey had been overseeing his law enforcement agency's investigation into alleged ties between the Trump campaign and Russia. Mr Trump referred to the "Russia thing" when asked why he was removed.
Mr Trump told a rally in Missouri on Friday evening that there was a "lingering stench" about what was being exposed at the US Justice Department.
He said he would get rid of it just as his administration "had gotten rid of bad people at the FBI".
What is the claim?
The New York Times reported that Mr Rosenstein had discussed recruiting cabinet members to invoke the 25th amendment of the US constitution, which provides for the removal of a president if he is deemed unfit for office.
It also says he suggested secretly recording Mr Trump to expose White House turmoil and dysfunction.
The suggestions came during meetings and conversations in May 2017 with Department of Justice and FBI officials, the paper said.
It cited several unnamed sources who were briefed on the events.
According to US media, the source of the allegations are memos created by former FBI acting director Andrew McCabe, who was fired by Mr Trump in March this year.
Mr McCabe's lawyer, Michael Bromwich, said his client "has no knowledge of how any member of the media obtained those memos".
Mr Bromwich said the memos had been submitted to the special counsel who is investigating possible Russian meddling in the 2016 election and obstruction of justice, and that another copy had remained with the FBI.
How did Mr Rosenstein respond?
The deputy attorney general issued a statement saying: "The New York Times's story is inaccurate and factually incorrect.
"I will not further comment on a story based on anonymous sources who are obviously biased against the department and are advancing their own personal agenda.
"But let me be clear about this: Based on my personal dealings with the president, there is no basis to invoke the 25th amendment."
Who's telling the truth?
A justice department press officer told the BBC that Mr Rosenstein's comment about secretly recording the president was a joke.
The statement was attributed to "a source who was in the room" and was said to remember the exchange in question.
"The statement was sarcastic and was never discussed with any intention of recording a conversation with the president," the unnamed source said.
The spokesperson did not immediately reply to an emailed question asking if the 25th amendment was discussed during that meeting.
In other US media, there was scepticism that the US deputy attorney general would earnestly propose ousting the president.
Activating the relevant section of the 25th amendment would require a majority of Mr Trump's cabinet, the vice-president and majorities in Congress, which is currently controlled by the president's party.
The Washington Post also reported that Mr Rosenstein's remark about surreptitious recordings was not serious.
The newspaper said the deputy attorney general had been responding to Andrew McCabe's suggestion that the justice department investigate the president.
According to the Post, Mr Rosenstein replied sarcastically: "What do you want to do, Andy, wire the president?"
The newspaper also said that someone who was present at the meeting denied the 25th amendment had ever come up.