The Trump administration is attempting to reverse decades-old policy to exclude a broad group of immigrants from accessing social services and health benefits, causing widespread fear among immigrant advocates even as it has yet to take effect.

Immigration groups and health experts say millions could be harmed by cutting off access to basic health services, including for people who are U.S. citizens and immigrants who have legal permission to be in the country. They have been pressing the administration for more information but say few details have been forthcoming.

“That’s the other thing about these notices — they leave so many questions unanswered,” said Tanya Broder, senior counsel on health and economic justice policy at the National Immigration Law Center.

“They don’t tell people

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