George Conway, the husband of White House counselor Kellyanne ConwayKellyanne Elizabeth ConwayWhite House seeks to clarify Trump remarks on emergency Trump says he 'didn't need to' declare emergency but wanted 'faster' action Trump dismisses Ann Coulter after criticism: 'I hardly know her' MORE and a frequent critic of President TrumpDonald John TrumpMcCabe says he was fired because he 'opened a case against' Trump McCabe: Trump said 'I don't care, I believe Putin' when confronted with US intel on North Korea McCabe: Trump talked to me about his election victory during 'bizarre' job interview MORE, blasted him Tuesday, saying his “stupidity knows no bounds” after Trump ripped into former aide Cliff Sims for his tell-all book.

 

The conservative lawyer has frequently used Twitter to post one-liners calling out the president.

He quote-tweeted a Washington Post opinion story with the headline “Trump is a fraud” with agreement. 

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Conway’s criticism attracts increased attention, particularly on social media, due to his wife’s role as a senior adviser and close confidante of Trump’s.

Trump took to Twitter early Tuesday to criticize Sims’s new book "Team of Vipers," the latest to come from former White House staffers depicting the chaos and infighting inside Trump’s administration.

Sims's book reportedly infuriated Trump, prompting him to tweet about it even though he was urged by his aides not to.

Trump's campaign has threatened to sue Sims for violating a nondisclosure agreement. The former communications aide left the White House in May.