President Trump on Monday accused Sen. Richard Blumenthal (D-Conn.) of lying about military service, saying he “should take a nice long vacation in Vietnam.”

“I think Senator Blumenthal should take a nice long vacation in Vietnam, where he lied about his service, so he can at least say he was there,” Trump tweeted.

I think Senator Blumenthal should take a nice long vacation in Vietnam, where he lied about his service, so he can at least say he was there — Donald J. Trump (@realDonaldTrump) August 7, 2017

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Trump was referencing a 2010 controversy in which Blumenthal admitted misspeaking about his military service.

Blumenthal acknowledged that he meant to say he served “during” the Vietnam War, as a reservist and not overseas, when he said he served “in” the war.

Trump earlier Monday accused Blumenthal of being a “phony Vietnam con artist,” the latest instance of the president bringing up the 2010 controversy.

The attack came after Blumenthal told CNN earlier Monday he was "concerned" the Department of Justice is "weaponizing" laws after it announced a crackdown on leaks.

Blumenthal fired back after the first tweet, writing: "Mr. President: Your bullying hasn't worked before and it won't work now. No one is above the law.”

Trump received five deferments from the draft and never served in the military himself.