A coalition of 20 Democratic attorneys general sued the Trump administration Thursday to block implementation of a rule they argue will undermine the Affordable Care Act.

The complaint was co-led by California, Massachusetts and New Jersey and filed in federal court in Massachusetts. The lawsuit alleges the Department of Health and Human Services (HHS) illegally made changes to the health law, which will make it harder for people to enroll and will shift costs to states.

The final rule,

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