Veteran journalist Carl Bernstein fired back after repeated attacks from President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE, saying he stands by his July report about the 2016 Trump Tower meeting.

“I have spent my life as a journalist bringing the truth to light, through administrations of both parties,” Bernstein tweeted at Trump. “No taunt will diminish my commitment to that mission, which is the essential role of a free press. @CNN stands by its story, and I stand by my reporting.”

.@realdonaIdtrump- I have spent my life as a journalist bringing the truth to light, through administrations of both parties. No taunt will diminish my commitment to that mission, which is the essential role of a free press. @CNN stands by its story, and I stand by my reporting. — Carl Bernstein (@carlbernstein) August 30, 2018

Bernstein response came after the president called him a “degenerate fool” who lives in the past and made up a fake story.

CNN is being torn apart from within based on their being caught in a major lie and refusing to admit the mistake. Sloppy @carlbernstein, a man who lives in the past and thinks like a degenerate fool, making up story after story, is being laughed at all over the country! Fake News — Donald J. Trump (@realDonaldTrump) August 29, 2018

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Bernstein, known for his coverage of the Nixon-era Watergate scandal, co-wrote an article for CNN that reported Trump's former lawyer and "fixer," Michael Cohen, was willing to testify before special counsel Robert Mueller Robert (Bob) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout MORE that then-GOP candidate Trump knew about the June 2016 meeting between Donald Trump Jr. Don John Trump'Tiger King' star Joe Exotic requests pardon from Trump: 'Be my hero please' Zaid Jilani discusses Trump's move to cancel racial sensitivity training at federal agencies Trump International Hotel in Vancouver closes permanently MORE and a Russian lawyer promising dirt on Democratic presidential candidate Hillary Clinton Hillary Diane Rodham ClintonFox News poll: Biden ahead of Trump in Nevada, Pennsylvania and Ohio Trump, Biden court Black business owners in final election sprint The power of incumbency: How Trump is using the Oval Office to win reelection MORE.

Cohen’s attorney, Lanny Davis, later confirmed that he was a source for Bernstein.

Davis, who is an opinion contributor at The Hill, said it was a “major mistake.”

“I regret not being much clearer in saying I'm not sure about this story,” Davis said on Tuesday. “It's a major mistake for which I am 100 percent sorry. Period. I never should have done it unless I was certain and could prove it.”

CNN has stood by Bernstein’s reporting, stating it had multiple sources.

"Make no mistake, Mr. President, CNN does not lie," the official Twitter account for CNN Communications tweeted late Wednesday. "We report the news. And we report when people in power tell lies. CNN stands by our reporting and our reporters. There may be many fools in this story but @carlbernstein is not one of them."

Make no mistake, Mr. President, CNN does not lie. We report the news. And we report when people in power tell lies. CNN stands by our reporting and our reporters. There may be many fools in this story but @carlbernstein is not one of them. — CNN Communications (@CNNPR) August 29, 2018

On Sunday, Trump Jr. claimed that CNN was “covering for leftist hack” Bernstein by standing by the story.

"Comical to watch @CNN covering for leftist hack @carlbernstein," the president's eldest son tweeted. "He & Obama staffer @jimsciutto obviously got story wrong. CNN 'stands by' it anyway, defending literal fake news. 3 'reporters' were fired for false CNN hit on [former White House communications director Anthony] Scaramucci & this is FAR worse!

This article was updated and corrected at 11:30 a.m.