Lawyer 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 and law professor Neal Katyal penned an op-ed published in The Washington Post on Wednesday calling for impeachment proceedings against President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE to begin.

Katyal and 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 and a frequent critic of Trump on Twitter, say Trump’s court filing arguing he cannot be investigated by Congress is the most recent indicator that lawmakers should begin impeachment proceedings.

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Trump “filed a brief in the nation’s second-most-important court that takes the position that Congress cannot investigate the president, except possibly in impeachment proceedings. It’s a spectacularly anti-constitutional brief, and anyone who harbors such attitudes toward our Constitution’s architecture is not fit for office,” the two men wrote.

The two lawyers wrote that the brief “is nothing if not an invitation to commencing impeachment proceedings that, for reasons set out in the Mueller report, should have already commenced.”

Conway and Katyal are referring to an appeals brief filed by Trump’s lawyers in the U.S. District Court of Appeals for the District of Columbia that argues against the House Oversight and Reform Committee’s ongoing probe into Trump’s business ventures and whether he broke the law by committing financial and tax fraud.

Trump "argues that Congress is 'trying to prove that the President broke the law' and that that’s something Congress can’t do, because it’s 'an exercise of law enforcement authority that the Constitution reserves to the executive branch,'" Conway and Katyal wrote.

The drumbeat of Democratic lawmakers calling for impeachment proceedings to begin has been growing, particularly after 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 gave his only public comments regarding the findings of his report into Russian election interference.

Speaker Nancy Pelosi Nancy PelosiPelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' On The Money: Anxious Democrats push for vote on COVID-19 aid | Pelosi, Mnuchin ready to restart talks | Weekly jobless claims increase | Senate treads close to shutdown deadline Trump signs largely symbolic pre-existing conditions order amid lawsuit MORE (D-Calif.) has tempered the conversation about impeaching Trump, pointing to the lack of Republican support outside of Rep. Justin Amash Justin AmashInternal Democratic poll shows tight race in contest to replace Amash Centrist Democrats 'strongly considering' discharge petition on GOP PPP bill On The Trail: How Nancy Pelosi could improbably become president MORE (R-Mich.), who has been the only Republican to publicly back opening impeachment proceedings.

“Congress could investigate Trump’s finances in an impeachment proceeding, but it can do so without launching the formal process of impeachment,” Conway and Katyal wrote, concluding that “Trump’s brief can be construed as an invitation to commence impeachment proceedings. In those proceedings, Trump’s attitudes toward our Constitution’s checks and balances, in addition to evidence of obstruction of justice, must play a key role.”