Trump knocks 'Da Nang Dick' Blumenthal after senator questions son's 'truthfulness'

President TrumpDonald John TrumpThe Hill's Morning Report - Sponsored by AdvaMed - House panel expected to approve impeachment articles Thursday Democrats worried by Jeremy Corbyn's UK rise amid anti-Semitism Warren, Buttigieg duke it out in sprint to 2020 MORE late Monday asked why Sen. Richard Blumenthal (D) is allowed to serve on the Judiciary Committee after the Connecticut lawmaker questioned whether the president's eldest son had been truthful in his testimony to Congress about his family's dealings with Russia.

"How does Da Nang Dick (Blumenthal) serve on the Senate Judiciary Committee when he defrauded the American people about his so called War Hero status in Vietnam, only to later admit, with tears pouring down his face, that he was never in Vietnam," Trump asked in a tweet.

"An embarrassment to our Country!" he added.

His tweet came minutes after Blumenthal told MSNBC's Rachel Maddow that he and other Democrats on the Senate Judiciary Committee had found "serious issues" with the "truthfulness" of Donald Trump Jr.Donald (Don) John TrumpTrump Jr. blasts Time for choosing 'marketing gimmick' Greta Thunberg as Person of the Year White House calls Democratic witness's mentioning of president's youngest son 'classless' Lawmakers to watch during Wednesday's impeachment hearing MORE and other witnesses' closed-door testimony to the panel.

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"I think many of them should be called back to testify in public and I hope that will be true of other congressional committees, as well, because behind closed doors, there was questions, serious issues concerning their truthfulness and that issue pertained particularly to Donald Trump Jr. in a number of contentions before our committee," Blumenthal said.

The president then resurfaced his frequently used "Da Nang Dick" nickname for the Democratic senator, who has faced questions in the past over his statements about to his military service.

The senator's own characterization of his service has differed in the past. In some statements, he claimed to have served "during the Vietnam era," while other statements are less ambiguous, including one statement in 2008 in which he said that he "served in Vietnam," according to The New York Times. He apologized in 2010, saying, "I have not been as clear or precise as I should have been about my service in the Marine Corps Reserves."

Blumenthal's office did not immediately respond to a request for comment from The Hill on Tuesday, but in the past has said that such tweets from the president are "not worth dignifying with a response."