"James Comey better hope that there are no "tapes" of our conversations before he starts leaking to the press", said Trump.
Trump told NBC he had planned to fire Comey all along, regardless of whether top Justice Department officials recommended the stunning step.
Anyone with even a remedial understanding of politics and public relations understands that Trump is bungling the White House reaction to the ongoing investigation, turning an already harrowing treason probe into a harrowing treason probe made far more toxic by an obvious coverup.
"As a very active President with lots of things happening, it is not possible for my surrogates to stand at podium with ideal accuracy!" he said. He also suggested accuracy might be improved by handing out written responses rather than holding press briefings.
Trump said Comey assured him that he was not personally under investigation for his ties to Russian Federation on three occasions - including once during a White House dinner where Comey "begged for his job".
Trump's warning prompted new accusations of interference in an investigation into allegations of collaboration between Russian Federation and the Trump presidential campaign past year.
Former FBI Director James Comey was furious at the lack of respect the White House showed him in the way he was sacked, sources have told ABC News.
Mr Trump doubled down in an interview with Fox News by threatening to hold the press briefings only once a fortnight, with himself at the podium.
Press Secretary Sean Spicer returned to the White House Press Room on Friday, though he decided not to clarify President Trump's latest, threatening remarks pertaining to the firing of James Comey.
"I have talked to the President".
"From my vantage ... the morale in the Federal Bureau of Investigation was very high and I can attest personally because I witnessed the very high esteem and respect that people in the Federal Bureau of Investigation have - still have - for Jim Comey", he said.
Spicer said Trump's "robust schedule" means that "sometimes we don't get an opportunity to get in to see him and get his full thinking".
"We had a very nice dinner and at that time he told me you are not under investigation", said Trump. "And I don't think I've heard anything since last night to clarify that in any way", said Sen.
Clapper's remarks came amid fallout from Trump's interview with NBC's Lester Holt Thursday. Trump's aides had floated the idea of moving the media from the White House to the nearby Executive Office Building to accommodate media interest.