George Conway George Thomas ConwayGeorge and Kellyanne Conway honor Ginsburg Lincoln Project releases new ad blasting Trump as 'a horrible role model' George Conway hits Trump on 9/11 anniversary: 'The greatest threat to the safety and security of Americans' MORE, a lawyer married to 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, argued Tuesday that special counsel Robert Mueller Robert (Bob) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout MORE's report must have "something pretty damning in it" if it could not exonerate 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 on the question of obstruction of justice.

Conway, a frequent critic of Trump who recently feuded with the president on Twitter, wrote in an op-ed in The Washington Post that it was "stunning" for Mueller to include a line in his report stating that "while this report does not conclude that the President committed a crime, it also does not exonerate him."

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"Mueller didn’t have to say that. Indeed, making that very point, the president’s outside counsel, Rudolph W. Giuliani, called the statement a 'cheap shot,'" Conway wrote. "But Mueller isn’t prone to cheap shots; he plays by the rules, every step of the way. If his report doesn’t exonerate the president, there must be something pretty damning in it about him, even if it might not suffice to prove a crime beyond a reasonable doubt."

Mueller's report has not been released publicly, but Attorney General William Barr Bill BarrProsecutor says no charges in Michigan toilet voting display Judge rules Snowden to give up millions from book, speeches The Hill's Morning Report - Sponsored by Facebook - Washington on edge amid SCOTUS vacancy MORE on Sunday shared a summary of what he described as Mueller’s "principal conclusions," revealing that Mueller did not find evidence to establish that members or associates of the Trump campaign conspired or coordinated with the Russian government to interfere in the 2016 election.

According to Barr, Mueller also "ultimately determined not to make a traditional prosecutorial judgment" regarding whether Trump attempted to obstruct the probe itself — leaving the decision up to the Justice Department.

Barr wrote that he and Deputy Attorney General Rod Rosenstein Rod RosensteinDOJ kept investigators from completing probe of Trump ties to Russia: report Five takeaways from final Senate Intel Russia report FBI officials hid copies of Russia probe documents fearing Trump interference: book MORE determined that the evidence was "not sufficient" to establish that Trump obstructed the investigation.

Conway argued that, based on the Justice Department summary, Mueller wrote his report in such a way that allows "the American people and Congress to decide what to make of the facts."

"Americans should expect far more from a president than merely that he not be provably a criminal," Conway wrote. "They should expect a president to comport himself in accordance with the high duties of his office."

Conway highlighted Trump’s frequent public attacks on Mueller, former Attorney General Jeff Sessions Jefferson (Jeff) Beauregard SessionsGOP set to release controversial Biden report Trump's policies on refugees are as simple as ABCs Ocasio-Cortez, Velázquez call for convention to decide Puerto Rico status MORE and other Justice Department officials throughout the nearly two-year investigation.

"If the charge were unfitness for office, the verdict would already be in: guilty beyond a reasonable doubt," Conway concluded.

Conway has emerged as one of the president’s most frequent critics, despite his wife’s high-ranking position in the Trump administration.

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Trump responded to the lawyer earlier this month, sharing a tweet from his campaign manager Brad Parscale accusing Conway of being jealous of his wife and calling him "a total loser!"

The men have continued to trade barbs on Twitter, with Trump calling Conway the "husband from hell" and a "whack job" and Conway calling Trump "nuts."

Kellyanne Conway has stood by the president, saying her husband is not a medical professional and should not be questioning his mental fitness.