President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE blasted George Conway, the husband of White House counselor Kellyanne Conway Kellyanne Elizabeth ConwaySpecial counsel investigating DeVos for potential Hatch Act violation: report George and Kellyanne Conway honor Ginsburg Trump carries on with rally, unaware of Ginsburg's death MORE, as a "stone cold loser" on Wednesday who is jealous of his wife's success.

George Conway, who questioned the president's mental fitness for office this week, is a "husband from hell," Trump said in a morning tweet that took the internal family feud to new heights.

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Trump said he barely knows Conway, who has become well-known for his tweets ripping apart the president. Conway once lived in Trump World Tower in New York with his wife, who served on the condo's board.

The D.C.-based attorney also was considered for a job at the Justice Department before withdrawing from consideration, which he has said was because of his opposition to Trump.

"George Conway, often referred to as Mr. Kellyanne Conway by those who know him, is VERY jealous of his wife’s success & angry that I, with her help, didn’t give him the job he so desperately wanted," the president wrote.

"I barely know him but just take a look, a stone cold LOSER & husband from hell!" Trump added.

George Conway, often referred to as Mr. Kellyanne Conway by those who know him, is VERY jealous of his wife’s success & angry that I, with her help, didn’t give him the job he so desperately wanted. I barely know him but just take a look, a stone cold LOSER & husband from hell! — Donald J. Trump (@realDonaldTrump) March 20, 2019

Conway responded in his own tweet, saying that Trump seems "determined" to prove his arguments, adding the hashtag #NarcissisticPersonalityDisorder.

You seem determined to prove my point. Good for you! #NarcissisticPersonalityDisorder https://t.co/ZSpb3UXVPC — George Conway (@gtconway3d) March 20, 2019

Conway's criticism of the Trump administration began shortly after his wife joined the White House and has continued largely unabated in recent weeks.

A day earlier, the president had briefly mentioned Conway in a tweet calling the attorney a "total loser," but Wednesday's comments are Trump's most direct aimed at Conway, who he has largely avoided mentioning by name previously.

Conway responded to the previous attack on Tuesday in his own tweet, accusing Trump of being obsessed with his critics.

“I thought it was a perfect example of the point I was making,” George Conway told The Washington Post in an interview. “He can’t concern himself with affairs of state. He’s more concerned about what people say about him and waging little battles with everyone and everything.”