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, lashed out at 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 in a new series of tweets early Thursday, saying that he is a liar and "the worst kind of dumb."

"As I said to @sbg1, to understand Trump 'you have to look at everything through the prism of his narcissism.' Once you do that, pretty much everything makes sense," the attorney said in another tweet, referring to The New Yorker's Susan Glasser.

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"He lies even when it makes no sense to lie. As one of his lawyers once told me, Trump couldn’t be allowed to talk to Mueller because 'he’d lie his ass off,' " he added.

Conway said in another post that it is "important" to understand that the president is dishonest about "everything."

"The only qualifier to this is that his compulsive lying is also important to understand. He lies, as we have seen, about everything, about matters big and small, about things that matter and things that don’t," he tweeted.

Yes. He’s worst kind of dumb. https://t.co/SKDRrPFuJu — George Conway (@gtconway3d) March 21, 2019

So the two keys to understanding Trump are narcisissm and compulsive prevarication. — George Conway (@gtconway3d) March 21, 2019

He lies even when it makes no sense to lie. As one of his lawyers once told me, Trump couldn’t be allowed to talk to Mueller because “he’d lie his ass off.” — George Conway (@gtconway3d) March 21, 2019

The only qualifier to this is that his compulsive lying is also important to understand. He lies, as we have seen, about everything, about matters big and small, about things that matter and things that don’t. — George Conway (@gtconway3d) March 21, 2019

The remarks are the latest volley between Conway and the president in a feud that boiled over earlier this week, with Trump addressing him directly on Twitter.

"A total loser!" Trump wrote on Tuesday.

On Wednesday, the president 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!"

George Conway, meanwhile, has maintained that the president's decision to address his criticism on Twitter showed that Trump was not fit for the job and is too easily distracted by personal attacks.

"You seem determined to prove my point. Good for you! #NarcissisticPersonalityDisorder," George Conway wrote.

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

Conway, a frequent critic of Trump, questioned the president's mental state earlier this week.

Kellyanne Conway on Wednesday defended Trump, however, saying her husband isn't a psychiatrist.