President Trump suggested he was just trying to keep fired FBI Director James Comey honest with his cryptic tweet implying there might be recordings of their private conversations.

Mr. Trump ended a monthlong guessing game Thursday by tweeting that he never made and doesn't have recordings of his private conversations with Mr. Comey. In an interview that aired Friday on "Fox & Friends," Trump said: "When he found out that I, you know, that there may be tapes out there, whether it's governmental tapes or anything else, and who knows, I think his story may have changed."

Asked if he was trying to keep Comey honest, Trump added: "It wasn't very stupid, I can tell you that. He was – he did admit that what I said was right."

The tapes saga began in May, just days after Trump fired Comey, who then was leading an investigation into Trump associates' ties to Russian officials. Trump has disputed Comey's version of a January dinner during which, according to Comey, the president asked for a pledge of loyalty.

Trump responded at that time, via Twitter, that Comey "better hope that there are no 'tapes' of our conversations before he starts leaking to the press!"

Trump, in the Fox News Channel interview, did not say exactly what he thought had changed about Comey's story. The former FBI director has only offered his story publicly once, in testimony before the Senate Intelligence Committee, although his associates provided some details to the news media before that.

Comey testified that he had told the president in multiple conversations he was not personally under federal investigation and said the president implored him to make that public. Trump has seized on that statement as vindication, though the investigation continues, as do congressional inquiries.

Comey also testified that Trump asked him for "loyalty" – which Trump emphatically denies.

Trump's initial Twitter missive about the possibility tapes triggered a series of consequences, each weightier than the last. Comey has suggested that the tweet prompted him to ask an associate to release damaging information to The New York Times. The resulting news reports built pressure on a top Justice Department official to appoint an independent prosecutor to oversee the Russia investigation. That special counsel, former FBI Director Robert Mueller, is now reportedly investigating Trump's own actions in a probe that could dog his presidency for the foreseeable future.

Trump showed concern about that situation as well, telling Fox that Mr. Mueller is "very, very good friends with Comey which is bothersome."

Trump's declaration now that there are no recordings appears to settle a key dynamic in that investigation: It's now the president's word against Comey's notes.

Without recordings, Comey's version of his conversations with Trump – which he documented at the time, shared with close associates, and testified about to Congress – will likely play a key role as prosecutors consider whether Trump inappropriately pressured the lawman to drop the investigation into former National Security Adviser Michael Flynn. Investigators will also weigh the credibility of Comey against a president who has shown a wobbly commitment to accuracy.

Trump adviser Kellyanne Conway muddied the waters a little Friday morning when she told CNN that, while Trump "answered definitively" he has made no tapes, "he left open the possibility that they may exist."

Trump's tweets, old and new, left many perplexed about whether there was motive or strategy behind the whole affair. The president appeared to enjoy ginning up mystery and spinning Washington reporters about the possibility there was a trove of surreptitiously recorded Oval Office conversations.

"I think he was in his way instinctively trying to rattle Comey," former House Speaker Newt Gingrich, a longtime Trump confidant, said before the Thursday tweets. "He's not a professional politician. He doesn't come back and think about Nixon and Watergate. His instinct is: 'I'll out-bluff you.' "

Thursday's revelation came a day ahead of a deadline to turn over any tapes to the House intelligence committee. The timing drew attention away from the release of the Senate's health care bill, which the White House hopes can provide Trump a much-needed legislative victory.

But the episode tired Trump's defenders and aides, who for weeks have been dodging questions about the recordings. Advisers who speak to Trump regularly have said he had not mentioned the existence of tapes during their conversations. More than a half-dozen aides said they were unaware of any recording devices. All demanded anonymity to speak about private discussions with the president.

White House spokeswoman Sarah Huckabee Sanders said Thursday she didn't think Trump regretted the initial tweet. As for his possible motivation, she would only say it was perhaps about "raising the question of doubt in general." She also could not explain Trump's new reference to possible surveillance.

Trump's earlier suggestion about tapes evoked the secret White House recordings that led to Richard Nixon's downfall in the Watergate scandal. Under a post-Watergate law, the Presidential Records Act, recordings made by presidents belong to the people and can eventually be made public. Destroying them would be a crime.

Sen. Mark Warner (D) of Virginia, top Democrat on the Senate intelligence committee, said, "This administration never ceases to amaze me." He said the tweeting is an example of Trump's "willingness to just kind of make things up."

"It's remarkable the president was so flippant to make his original tweet and then frankly stonewall the media and the country for weeks," Mr. Warner said. "I don't know how this serves the country's interests."

This is not the first time that Trump, the former star of reality TV and tabloids, has manufactured a melodrama that begins with bluster but often ends with a whimper.

Trump flirted with presidential runs in 1988 and 2000 before abandoning them. He offered to help rebuild the World Trade Center in 2004 but never followed through. And his embrace of birtherism, which questioned whether Obama was born in the United States and was eligible to become president, fueled his own political rise. He never produced any evidence.

The pattern has continued since Trump's election.

On New Year's Eve, he claimed he knew "things that other people don't know" about foreign hacking of last year's election, and that the information would be revealed "on Tuesday or Wednesday." Those days came and went without an answer. In March, he tweeted the incendiary claim that he was wiretapped by his predecessor, a charge he's never supported.

He's brought trouble to his White House.

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At a Senate committee hearing this month, Comey suggested that the president's reference to possible recordings inspired him to disclose to the media through an intermediary a memo he had written of their Oval Office conversation. In that meeting, according to the memo, Trump told Comey he hoped he would let the Flynn investigation go. Comey said he understood that to be a request to drop the probe.

One week after the memo was disclosed, the Justice Department appointed Mueller as special counsel to take over the investigation into contacts between Russia and the Trump political campaign.