"With all of the recently reported electronic surveillance, intercepts, unmasking and illegal leaking of information," Trump tweeted yesterday, he has "no idea" whether there are "tapes" or recordings of the two men's conversations.
But he proclaimed "I did not make, and do not have, any such recordings."
That left open the possibility that recordings were made without his knowledge or by someone else.
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!"
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That apparently angry missive 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 media.
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 News Channel in an interview that Mueller is "very, very good friends with Comey which is bothersome."
In that interview that aired Friday morning on "Fox & Friends," Trump also suggested a motivation behind the tapes tweet.
"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," Trump said. "I mean you'll have to take a look at that, because then he has to tell what actually took place at the events."
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.
"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.