George Conway, the husband of White House counselor Kellyanne ConwayKellyanne Elizabeth ConwayThe Hill's Morning Report - In exclusive interview, Trump talks Biden, Iran, SCOTUS and reparations EXCLUSIVE: Trump says it's not appropriate for Megan Rapinoe to protest during national anthem White House to block Conway from testifying over alleged Hatch Act violations MORE and a frequent critic of President TrumpDonald John TrumpNew EPA rule would expand Trump officials' powers to reject FOIA requests Democratic senator introduces bill to ban gun silencers Democrats: Ex-Commerce aide said Ross asked him to examine adding census citizenship question 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.