George Conway, a longtime critic of President Trump, filed paperwork with the Federal Election Commission Monday to run for Congress as a Democrat.

The co-founder of The Lincoln Project, an organization of ostensible Republicans dedicated to opposing the 45th and 47th president, will explore representing New York’s 12th Congressional District, a seat based in Manhattan and currently held by outgoing Rep. Jerrold Nadler.

The Post’s messages to an email address linked to Conway’s campaign drew no response Monday.

Conway will join a field of colorful Democratic contenders that includes JFK grandson Jack Schlossberg and March for Our Lives organizer Cameron Kasky, as well as state Assemblymen Alex Bores and Micah Lasher.

Councilmember Erik Bottcher, another who had announced he was seeking Nadler’s seat, changed course shortly after Conway filed — announcing that he would instead run for the state Senate to replace the departing Brad Hoylman-Sigal.

The 62-year-old Conway, a graduate of Harvard College and Yale Law School, was married for 22 years to Kellyanne Conway, Trump’s 2016 campaign manager who went on to become counselor to the president during the Republican’s first term.

The couple announced their divorce in March 2023, putting an end to years of speculation that accompanied George Conway’s increasingly strident social media criticisms of Trump and Kellyanne’s equally impassioned defenses.

George Conway himself had been considered for the solicitor general post in the first Trump administration, but ultimately withdrew his name. The job went to Noel Francisco.

In her 2022 memoir “Here’s The Deal,” Kellyanne Conway described her husband as a “Trump-loving, MAGA-cap-wearing” diehard who slowly turned his back on her and their four children over her White House gig.

She recounted one blowup over the July 4 weekend in 2019, during which George told her: “You have ruined yourself and you have embarrassed this family.”

“I’ve embarrassed this family?” Kellyanne claimed to have responded. “You abandoned me for Twitter and she’s not even hot.”

Months later, George Conway helped launch The Lincoln Project, with the goal of defeating Trump’s bid for a second consecutive term. He announced in August 2020 that he would take a leave of absence to spend more time with his family, with Kellyanne announcing the same day that she would leave her White House role.

The following February, Conway called for The Lincoln Project to shut down following allegations of serial sexual harassment against another co-founder, longtime John McCain campaign adviser John Weaver.

While married, the Conways divided their time between Alpine, NJ, and Washington, DC, but records reviewed by The Post indicate that George maintains a residence in — ironically — the Trump World Tower at UN Plaza.

“George Conway is a conservative corporate lawyer with no record of public service in New York City or commitment to the values of Democratic voters,” Democratic consultant Chris Sosa told The Post in response to the filing. “He spent the majority of his career as a Republican and only left because he couldn’t stomach President Donald Trump.

“Democratic voters are not about to elect the former president of Yale’s chapter of the Federalist Society to succeed Rep. Jerry Nadler,” Sosa added. “If Mr. Conway wishes to move up to New York City and run for NY-12, he should enter the Republican primary. I do admire Mr. Conway for standing up to President Trump. We need conservative voices to do just that. But running as a Democrat for Congress in NY-12 is cynical.”

Additional reporting by Matthew Fischetti