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, 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, on Sunday decried President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE for viewing 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 investigation "purely in terms of your own ego," stating that the actions Trump took in his own self-interest should be enough to remove him from office.

"Think of it," Conway, a frequent critic of Trump, said on Twitter. "The Russia investigation was a legitimate investigation, with a legitimate basis, into how a hostile foreign power tried to interfere with and undermine our democracy."

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Conway continued, saying it was in the best interest of both Republicans and Democrats for the Russia investigation to proceed without interference.

"But because you are a malignant narcissist—a person with both narcissistic and antisocial personality disorders—you couldn’t view it that way," Conway tweeted. "Instead of complying with your oath of office, and instead of taking stock of what was in the best interests of the nation whose Constitution and laws you swore to uphold, you viewed the matter purely in terms of your own ego: You viewed the investigation as casting doubt on what you perceive as your great election victory."

Conway also accused Trump of obstruction of justice, saying that the president "repeatedly lied" from the outset of Mueller's investigation.

"Even today, despite the well-founded assessments of the intelligence community, and despite the damning evidence laid out in the Mueller report, you refuse to take what the Russians did seriously," Conway said.

He called out Trump for placing his "self-interest" above the nation's, saying it is his "greatest offense against the country, an offense that incorporates but vastly exceeds the statutory crimes you’ve committed."

"It is an offense for which you should pay with your office, regardless of whether you are ultimately brought to justice in the courts of law," he said.

... they voted for—that this investigation be allowed to proceed to its rightful conclusion, without improper attempts to obstruct it, if only so that we could all know what really happened and take steps to see that it never happens again. But because ...https://t.co/IOCKB0x4v7 — George Conway (@gtconway3d) May 12, 2019

... the nation whose Constitution and laws you swore to uphold, you viewed the matter purely in terms of your own ego: You viewed the investigation as casting doubt on what you perceive as your great election victory (in which your opponent garnered ...https://t.co/IOCKB0x4v7 — George Conway (@gtconway3d) May 12, 2019

... damning evidence laid out in the Mueller report, you refuse to take what the Russians did seriously. Instead, you continue to lie, calling the investigation a “hoax” and an “attempted coup,” and you didn’t even mention Russia’s ...https://t.co/IOCKB0x4v7 — George Conway (@gtconway3d) May 12, 2019

... That is your greatest offense against the country, an offense that incorporates but vastly exceeds the statutory crimes you’ve committed. It is the ultimate high crime or misdemeanor under the Constitution, and under the Framers’ wise design, ...https://t.co/IOCKB0x4v7 — George Conway (@gtconway3d) May 12, 2019

... it is an offense for which you should pay with your office, regardless of whether you are ultimately brought to justice in the courts of law. https://t.co/IOCKB0x4v7 — George Conway (@gtconway3d) May 12, 2019

The comments from Conway came moments after Trump declared the Mueller probe "sick and unlawful."

Mueller's 22-month investigation into Russia's interference and whether Trump committed obstruction of justice concluded earlier this year. Mueller's report said that the special counsel did not uncover evidence to conclude that a conspiracy took place between the 2016 Trump campaign and Moscow.

The report also said that Mueller could not come to a conclusive determination in regard to whether Trump obstructed justice.

Conway said in April that Trump's misconduct was "worse" than the misconduct that led to former President Nixon's resignation.