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.

GOP congressional leaders managed to deliver the legislation to the president's desk ahead of his self-imposed July 4 deadline.

It was a long-shot effort to compile a lengthy list of GOP priorities into what they called his “one big beautiful bill,” at nearly 900 pages.