President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE on Saturday tweeted a quote from conservative commentator and former Secret Service agent Dan Bongino criticizing former CIA Director John Brennan John Owen BrennanJournalism or partisanship? The media's mistakes of 2016 continue in 2020 Comey on Clinton tweet: 'I regret only being involved in the 2016 election' Ex-CIA Director Brennan questioned for 8 hours in Durham review of Russia probe MORE.

Trump quoted Bongino from an appearance on “Fox & Friends” one day after Brennan wrote a scathing op-ed about Trump in The Washington Post.

“John Brennan, no single figure in American history has done more to discredit the intelligence community than this liar,” Trump tweeted. “Not only is he a liar, he’s a liar about being a liar.”

“John Brennan, no single figure in American history has done more to discredit the intelligence community than this liar. Not only is he a liar, he’s a liar about being a liar.” Dan Bongino on @foxandfriends — Donald J. Trump (@realDonaldTrump) June 2, 2018

Bongino, the host of his own podcast “The Dan Bongino Show” and a host for NRATV, appeared on “Fox & Friends” Saturday morning.

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Trump, who is spending the weekend at Camp David, has quoted Bongino’s Fox News appearances in the past.

Brennan is a frequent and harsh critic of the president, and wrote an op-ed in The Washington Post on Friday that compared Trump to “corrupt, incompetent … demagogues.”

In the piece, Brennan defended himself against critics who have said he should not be so political, saying that he would continue criticizing Trump “until integrity returns to the White House.”

“I speak out for the simple reason that Mr. Trump is failing to live up to the standards that we should all expect of a president,” Brennan wrote.