Demand Justice, an outside progressive group, is targeting a handful of Republican senators up for reelection in 2020 over a controversial court nominee.

The group is running digital ads aimed at GOP Sens. Susan Collins Susan Margaret CollinsSenate GOP aims to confirm Trump court pick by Oct. 29: report The Hill's Campaign Report: GOP set to ask SCOTUS to limit mail-in voting Senate GOP sees early Supreme Court vote as political booster shot MORE (Maine), 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.), Cory Gardner Cory Scott GardnerOvernight 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 Senate GOP sees early Supreme Court vote as political booster shot MORE (Colo.) and Joni Ernst Joni Kay ErnstThe Hill's Campaign Report: GOP set to ask SCOTUS to limit mail-in voting Liberal super PAC launches ads targeting vulnerable GOP senators over SCOTUS fight Romney backs pre-election Supreme Court vote, paving way for McConnell, Trump MORE (Iowa) ahead of the Senate’s vote on Chad Readler’s circuit court nomination.

“Chad Readler is the architect of the Trump legal strategy to roll back Obamacare. A vote for Readler is a vote to get rid of protections for people with preexisting conditions,” said Demand Justice Executive Director Brian Fallon.

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Collins, Tillis, Gardner and Ernst are up for reelection in purple states and viewed as top targets by Democrats. Collins and Gardner, in particular, are running in states won by 2016 Democratic presidential candidate Hillary Clinton Hillary Diane Rodham ClintonButtigieg stands in as Pence for Harris's debate practice Senate GOP sees early Supreme Court vote as political booster shot Poll: 51 percent of voters want to abolish the electoral college MORE and are viewed as vulnerable.

“Senator Susan Collins says she supports protections for people with pre-existing conditions. So why would she vote to support Chad Readler?” reads a version of the Demand Justice ad targeting Collins.

Democrats and their outside group allies have homed in on Readler’s nomination because of his views on an anti-ObamaCare lawsuit. The Senate will take a procedural vote on Readler’s nomination on Tuesday.

Readler, who previously worked as an assistant attorney general for the civil division at the Department of Justice, filed a brief last year supporting a lawsuit filed by Texas and other states seeking to strike down the Affordable Care Act.

All 47 Democrats are expected to vote against Readler’s nomination, but they can’t block him on their own. Democrats nixed the 60-vote filibuster for district and circuit court judges in 2013.

Senate Minority Leader Charles Schumer Chuck SchumerSenate Democrats introduce legislation to probe politicization of pandemic response Schumer interrupted during live briefing by heckler: 'Stop lying to the people' Jacobin editor: Primarying Schumer would force him to fight Trump's SCOTUS nominee MORE (D-N.Y.) said on Tuesday that Republicans couldn’t both support Readler and say they support protecting people with pre-existing conditions.

“It’s all well and good to say you want to protect them but those promises and pronouncements mean next to nothing if they won’t vote to reject a lifetime appointment for the man who played the starring role in the legal effort to take these conditions away,” Schumer said.

Fallon, who previously worked for Schumer, added that Republicans “are in a bind because they like to pretend to support the most popular parts of Obamacare, but voting for Readler will make hypocrites out of them all.”