George Conway, the husband of 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, suggested on Monday that 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 obstructed justice and tampered with a witness when he praised Roger Stone Roger Jason StoneThe agony of justice Our Constitution is under attack by Attorney General William Barr Justice IG investigating Stone sentencing: report MORE for vowing never to testify against the president.

"File under '18 U.S.C. §§ 1503, 1512,'" George Conway tweeted, a reference to the statutes for obstruction of justice and tampering with witnesses, informants or victims, respectively.

George Conway, an attorney, was quoting a tweet in which the president lauded Stone for saying there's "no circumstance" in which he would testify against Trump because it would mean he'd "have to make things up."

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"Nice to know that some people still have 'guts!' " Trump wrote.

Stone made the comments in an interview on Sunday, and added that he had not been in discussions with the president about a potential pardon should he be indicted by 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.

George Conway regularly shares opinions critical of the president's policies and rhetoric, particularly regarding the special counsel's investigation.

Neal Katyal, who served as acting solicitor general during the Obama administration and has co-written opinion pieces with George Conway, on Monday concurred with his implication.

"This is genuinely looking like witness tampering," he tweeted. "DOJ (at least with a nonfake AG) prosecutes cases like these all the time. The fact it's done out in the open is no defense."

George is right. This is genuinely looking like witness tampering. DOJ (at least with a nonfake AG) prosecutes cases like these all the time. The fact it's done out in the open is no defense. Trump is genuinely melting down, and no good lawyer can represent him under these circs https://t.co/zqFUoQvWTf — Neal Katyal (@neal_katyal) December 3, 2018

In separate tweets on Monday, Trump targeted both Mueller and his former personal attorney, Michael Cohen, who last week agreed to cooperate with the special counsel and pleaded guilty to lying to Congress about negotiations for a Trump Tower in Moscow that took place during the 2016 presidential campaign.

Trump repeated his claim that Cohen, who worked for years at the Trump Organization, lied to get a reduced sentence. He asserted that Cohen should "serve a full and complete sentence."

“Michael Cohen asks judge for no Prison Time.” You mean he can do all of the TERRIBLE, unrelated to Trump, things having to do with fraud, big loans, Taxis, etc., and not serve a long prison term? He makes up stories to get a GREAT & ALREADY reduced deal for himself, and get..... — Donald J. Trump (@realDonaldTrump) December 3, 2018

Cohen said in his guilty plea that he was untruthful about his involvement in plans to build a Trump Tower in Moscow in order to remain loyal to the president and consistent with his “political message.”

Cohen previously told Congress that negotiations to build a Trump Tower in Moscow ended in January 2016, but emails showed that he continued to talk with a Russian developer about the project into the summer of 2016 and kept Trump informed of the talks amid the presidential campaign.

Trump has downplayed the negotiations, calling it "very legal & very cool" that he continued to run his business while campaigning for president.