Fox News conservative political commentator Charles Krauthammer on Friday slammed President Trump Donald John TrumpBarr criticizes DOJ in speech declaring all agency power 'is invested in the attorney general' Military leaders asked about using heat ray on protesters outside White House: report Powell warns failure to reach COVID-19 deal could 'scar and damage' economy MORE for a tweet warning former FBI Director James Comey about leaking information.

“All of a sudden you’re raising something nobody had imagined and saying you better watch out,” Krauthammer said. "That’s un-presidential, which is kind of a nice way of saying that that sounds more like a mafia boss than the president of a free republic.”

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In a tweet that also accused the former FBI director of leaking to the press, Trump introduced the idea of recordings of conversations between the president and the man that Trump fired as head of the FBI earlier in the week.

James Comey better hope that there are no "tapes" of our conversations before he starts leaking to the press! — Donald J. Trump (@realDonaldTrump) May 12, 2017

In an interview with Fox News’ Jeanine Pirro, Trump refused to discuss the tweet.

“Well, that I can’t talk about,” Trump said. “I won’t talk about that. All I want is for Comey to be honest and I hope he will be, and I’m sure he will be, I hope.”

Krauthammer has previously criticized Trump’s decision to fire Comey, calling it “inexplicable.”