The Lincoln Project, an anti-Trump group led by 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, a Washington, D.C., lawyer who is married to 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, released a video targeting four Republican senators over their “spineless servility” to the president.

The group criticizes the Republicans for their “allegiance to [President] Trump over the voters who elected them in their states.”

“This fall, the Lincoln Project will help several Republican senators on their way to forced retirement,” the narrator of the ad states.

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“Join us in making sure these winners can start looking for their K Street offices,” the narrator adds.

The video targets GOP Sens. Susan Collins Susan Margaret CollinsClub for Growth to spend million in ads for Trump Supreme Court nominee Maryland's GOP governor says Republicans shouldn't rush SCOTUS vote before election The Hill's Morning Report - Sponsored by Facebook - GOP closes ranks to fill SCOTUS vacancy by November MORE (Maine,) Cory Gardner Cory Scott GardnerCook Political Report shifts Colorado Senate race toward Democrat Overnight Health Care: US coronavirus deaths hit 200,000 | Ginsburg's death puts future of ObamaCare at risk | Federal panel delays vote on initial COVID-19 vaccine distribution The Hill's Campaign Report: GOP set to ask SCOTUS to limit mail-in voting MORE (Colo.), Martha McSally Martha Elizabeth McSallyThe Hill's Campaign Report: Presidential polls tighten weeks out from Election Day Mark Kelly: Arizona Senate race winner should be sworn in 'promptly' New ABC/WaPost poll finds Trump edging Biden in Arizona, Florida MORE (Ariz.) and Thom Tillis Thomas (Thom) Roland TillisThe Hill's Campaign Report: GOP set to ask SCOTUS to limit mail-in voting OVERNIGHT ENERGY: EPA head questions connection of climate change to natural disasters | Pebble Mine executives eye future expansion in recorded conversations | EPA questions science linking widely used pesticide to brain damage in children Liberal super PAC launches ads targeting vulnerable GOP senators over SCOTUS fight MORE (N.C.), four of the most vulnerable Republican senators up for reelection.

Each of the four races are rated a "toss up" by The Cook Political Report.

“Senators Collins, Gardner, McSally and Tillis have spent too much of their time in office enabling Donald 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 and not enough time fighting for the needs of their constituents,” Jennifer Horn, co-founder of The Lincoln Project, said in a statement.

“Their defense of Trump’s unpresidential behavior and unfitness for office has disqualified them from the privilege of serving in the United States Senate,” she added.

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A spokesperson for the National Republican Senatorial Committee (NRSC) slammed the Lincoln Project in response to the video.

"It’s sad to see the media treating this pathetic Democrat scam PAC seriously," NRSC spokesman Nathan Brand said in an email. "Just because a group of bitter, failed political consultants are lining their own pockets by ripping off donors, doesn’t mean they deserve any attention for their lies.”

Spokespeople for the senators' reelection campaigns were not immediately available for comment.

—Updated at 2:39 p.m.