A coalition of mayors, doctors groups, and Democratic state attorneys general have filed lawsuits against the Trump administration challenging recent changes to the Affordable Care Act (ACA) enrollment rules. The lawsuits contend that the Trump administration's new regulations restrict access to ACA marketplace insurance, particularly by limiting enrollment periods and barring undocumented immigrants from accessing certain health centers. The legal challenges also target Department of Health and Human Services (HHS) changes affecting ACA marketplaces and seek to block immigration-related requirements for federal programs such as Head Start. These actions reflect ongoing opposition to the administration's efforts to tighten eligibility and enrollment criteria for federal health insurance programs.