New Trump administration rules that give millions of people less time to sign up for the Affordable Care Act’s coverage, and bar some immigrants from buying the health care coverage, are facing a legal challenge from Democratic mayors.

A group of Democratic-led cities sued the Trump administration Tuesday over new changes to the Affordable Care Act that they say will undermine the sweeping health care law and result in nearly 2 million Americans losing health insurance.

One health policy professor said cutting Medicaid and similar programs "will be devastating" to millions of Americans.

It also takes aim at Medicaid, the federal and state health program that covered 78.6 million low-income children and adults as of March 2025, according to the Centers for Medicare & Medicaid Services.

WASHINGTON (AP) — Roughly 11.8 million adults and children will be at risk for losing health insurance if Republicans’ domestic policy package becomes a law.