George Conway, the husband of White House counselor Kellyanne Conway Kellyanne Elizabeth ConwayGeorge and Kellyanne Conway honor Ginsburg Trump carries on with rally, unaware of Ginsburg's death George Conway hits Trump on 9/11 anniversary: 'The greatest threat to the safety and security of Americans' MORE and a frequent critic of President Trump Donald John TrumpUS reimposes UN sanctions on Iran amid increasing tensions Jeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Trump supporters chant 'Fill that seat' at North Carolina rally MORE, blasted him Tuesday, saying his “stupidity knows no bounds” after Trump ripped into former aide Cliff Sims for his tell-all book.

Your stupidity knows no bounds. https://t.co/Ac6eQmTgOx — George Conway (@gtconway3d) January 29, 2019

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.

A low level staffer that I hardly knew named Cliff Sims wrote yet another boring book based on made up stories and fiction. He pretended to be an insider when in fact he was nothing more than a gofer. He signed a non-disclosure agreement. He is a mess! — Donald J. Trump (@realDonaldTrump) January 29, 2019

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.