The bipartisan group will challenge hard-right House Republicans in their home districts, running ads that accuse the lawmakers of holding antidemocratic positions.
Representative Marjorie Taylor Greene said the detainees had reported mistreatment, but a Democratic lawmaker said their conditions were better than others.
Gov. Ron DeSantis of Florida spoke on Monday about Donald Trump’s expected indictment, as Republicans weighed whether to heed the former president’s call to protest.