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Trump tweet: ‘Comey better hope there are no tapes of our conversations’

President Donald Trump makes remarks prior to signing an "Antiquities Executive Order" at the Department of the Interior, on April 26, 2017 in Washington, DC. Interior will review prior monument designations made by former Presidents Barack Obama, George W. Bush and Bill Clinton. (Photo by Mike Theiler-Pool/Getty Images)

(CNN) — President Donald Trump issued a thinly veiled threat Friday to fired FBI Director James Comey.

“James Comey better hope that there are no ‘tapes’ of our conversations before he starts leaking to the press,” the President tweeted.

The tweet marks an extraordinary development in the ongoing feud between Trump and the agencies investigating alleged ties between his campaign and Russia.

When he fired Comey earlier this week, Trump garnered comparisons to President Richard Nixon and his infamous decision to remove the special prosecutor investigating Watergate crimes in 1973. The Watergate scandal accelerated drastically when it was revealed Nixon taped conversations in the White House. Trump didn’t provide further details Friday on whether he was taping conversations.

Soon after tweeting the threat to Comey, Trump invoked former Director of National Intelligence James Clapper, who testified before the Senate earlier this week that he was not aware of any evidence demonstrating collusion between Trump’s campaign and Russia.

“When James Clapper himself, and virtually everyone else with knowledge of the witch hunt, says there is no collusion, when does it end?” Trump tweeted.

On Thursday, Trump, discussing the firing of Comey, told NBC News that he was frustrated by the ongoing investigation and believed it was motivated by Democrats’ fury at losing the election.

Trump told NBC’s Lester Holt: “And in fact when I decided to just do it, I said to myself, I said ‘you know, this Russia thing with Trump and Russia is a made-up story, it’s an excuse by the Democrats for having lost an election that they should have won.'”