George Conway, the husband of White House counselor Kellyanne ConwayKellyanne Elizabeth ConwayGeorge Conway: If Trump pushed Ukraine to investigate Biden, he 'should be impeached and removed from office' Obama, Bush among those paying tribute to Cokie Roberts: 'A trailblazing figure' Journalists, political heavyweights pay respects to Cokie Roberts: 'A pioneer for so many' MORE and a frequent critic of President TrumpDonald John TrumpMarine unit in Florida reportedly pushing to hold annual ball at Trump property Giuliani clashes with CNN's Cuomo, calls him a 'sellout' and the 'enemy' Giuliani says 'of course' he asked Ukraine to look into Biden seconds after denying it 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.