Asked by Fox News Channel whether Mueller should "recuse himself from the investigation", Trump said three times "we'll have to see", and argued that Mueller's long friendship with fired FBI director James B. Comey and hiring of investigators with Democratic ties are "very bothersome" and "ridiculous". But when he found out that I, you know, that there may be tapes out there, whether it's government tapes or anything else, and who knows, I think his story may have changed.
He fell short of accusing Trump of trying to squash the bureau's Russian Federation investigation, but Comey said he was concerned with some of what Trump said to him during several phone and in-person meetings this year.
"I didn't tape", Trump said.
While testifying before the House Intelligence Committee, Mr Comey said he hoped there were tapes.More news: Nevada's Heller is fifth GOP senator to oppose health-care bill
Mr Trump criticised Mr Mueller for having appointed "all Hillary Clinton supporters" to his staff for the investigation.
But Comey said during his June 8 testimony before Congress that Trump's tweet did influence him, though not the way Trump suggests.
Trump's initial Twitter missive about the possibility tapes triggered a series of consequences, each weightier than the last.
After President Trump had fired Comey, he began slamming the credibility and the reputation of both the FBI and its former director saying that the bureau was in disarray. It appears that Trump's description of the two as "very, very good friends" isn't rooted in reality. Advisers who speak to Trump regularly have said he had not mentioned the existence of tapes during their conversations. She interviewed Trump and his wife, Melania, at the White House during Thursday night's congressional picnic. She also could not explain Trump's new reference to possible surveillance. Trump tweeted. Leaders of the House and Senate Russia investigations had asked Trump to produce the tapes, if they existed. Destroying them would be a crime. He said the tweeting is an example of Trump's "willingness to just kind of make things up". "I don't know how this serves the country's interests". In March, he tweeted the incendiary claim that he was wiretapped by his predecessor, a charge he's never supported. A former federal prosecutor, David Kelley, says Mueller and Comey haven't visited each other's homes and rarely shared a meal together.