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President Donald Trump said Thursday on Twitter that he did not make and doesn't have any recordings of his private conversations with fired FBI Director James Comey.

In a tweet last month, Trump said Comey should "hope" no such tapes existed, prompting Comey to then leak memos about the conversations to the media.

Now, some Democrats are claiming that Trump's tweets don’t constitute an official response from the White House, and they're calling for further investigation into Trump's possible intimidation of a witness.

On "Special Report" tonight, Charles Krauthammer said this goes to show how "desperate" Democrats are becoming.

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He said the suggestion that Trump's tweet about "tapes" constitutes intimidation of a witness is "pure rubbish."

"We're now at sort of the tertiary level of accusation," Krauthammer said. "You can't get anywhere on collusion. We have yet, in almost a year, to have any evidence of collusion. So they're on to obstruction. Obstruction is really kind of shaky. There isn't really that much there. So now you want to go on to intimidation of a witness."

He said the Democrats are growing more "desperate," and all the allegations essentially amount to "tail-chasing."

"If the Democrats want to spend the next year, year-and-a-half in a rabbit hole, be our guest," Krauthammer concluded.

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