J.W. Verret, a George Mason University law professor who briefly worked on 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's transition team, is calling for Congress to begin impeachment proceedings against Trump following the release of 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.

Verret, who worked as deputy director of economic policy for Trump's presidential transition from August to October 2016, first argued for impeachment last week, saying that there was "enough" in Mueller's report to justify it.

That does not suggest what the outcome of such a proceeding will be, impeachment is only the beginning of an inquiry. Analogous to a grand jury investigation. But it’s time, it really is. — J.W. Verret (@JWVerret) April 20, 2019

Verret expanded upon his argument on Tuesday, writing in a column for The Atlantic that the Mueller report served as a "tipping point" for him, one that sparked him to transition "from Trump team member to pragmatist about Trump to advocate for his impeachment."

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Verret, who has worked on every Republican presidential transition team of the last decade, writes that he was one of the first individuals to join Trump's after interviewing for the job in August 2016. But he noted that he "amicably" parted ways with the team in October after it became clear he wasn't a fit. Verret said he never hid his distaste of Trump's rhetoric on immigration and trade.

But he said never considered joining the "Never Trump" Republicans until the Mueller report's release.