President Trump on Thursday blasted CNN, saying host Chris Cuomo didn't ask Sen. Richard Blumenthal (D-Conn.) during an earlier interview about the Connecticut senator's "long-term lie" of serving in the Vietnam War.

"Chris Cuomo, in his interview with Sen. Blumenthal, never asked him about his long-term lie about his brave 'service' in Vietnam," the president tweeted.

"FAKE NEWS!"

Chris Cuomo, in his interview with Sen. Blumenthal, never asked him about his long-term lie about his brave "service" in Vietnam. FAKE NEWS! — Donald J. Trump (@realDonaldTrump) February 9, 2017

Cuomo immediately addressed Trump's tweet on the air, with the network re-broadcasting the beginning of Cuomo's interview with Blumenthal, when Cuomo asked Blumenthal about misrepresenting his military record in the past.

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In response to the question, Blumenthal defended his statements that Judge Neil Gorsuch, Trump's Supreme Court nominee, expressed concern to him about the president's attacks on federal judges.

"The president ... is once again off on the facts": @ChrisCuomo's response to @realDonaldTrump's tweet about himhttps://t.co/42q1zH0gtR — New Day (@NewDay) February 9, 2017

"Really, the first point that I made in the interview," Cuomo said on CNN.

"The president, with all due respect, is once again off on the facts. And that's not something that any of us have any desire to say on a regular basis, but it keeps being true," Cuomo continued.

"Fake news is the worst thing that you can call a journalist. It's like an ethnic disparagement. We all have these ugly words for people. That's the one for journalists."

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Cuomo said the president keeps doubling down when the facts "don't favor his position."

"Once again, he doubles down when he's wrong," he said.

Trump has repeatedly said he doesn't watch CNN, but his tweet came shortly after the Blumenthal interview aired Thursday morning.

Trump was referring in his tweet to a controversy during Blumenthal's 2010 Senate campaign.

In 2010, Blumenthal held a press conference during which he said he had misspoken about his service in the Vietnam War. He was in the Marine Corps Reserves for six years during the war. He said during the news conference in 2010 he meant to say "during Vietnam" but instead said he served "in" Vietnam.

"On a few occasions I have misspoken about my service, and I regret that and I take full responsibility," Blumenthal said at the 2010 press conference, according to a Washington Post report. "But I will not allow anyone to take a few misplaced words and impugn my record of service to our country."

A report last year found that Trump has received five deferments from the military draft during the Vietnam War. He was granted one medical and four education deferments, which kept him out of the conflict.