This resolution would cancel a federal rule that changed how the Affordable Care Act health insurance marketplaces (the online exchanges where people without job-based coverage can buy health plans, sometimes with government subsidies) operate. That rule had set a firm enrollment window of November 1 to December 31 each year, required extra proof of eligibility for most people signing up outside that window, barred DACA recipients (immigrants brought to the U.S. as children who are protected from deportation but aren't full legal residents) from buying marketplace plans or joining state low-income health programs, and stopped individual and small-business insurance plans from being required to cover certain gender-transition-related medical procedures. If this resolution passes, that rule would be undone, meaning those specific changes would no longer be in effect.