In a class action federal lawsuit filed Wednesday, 15 low-income Kentucky residents enrolled in Medicaid sued the Trump administration for giving the state’s Republican governor a green light to impose work requirements and other eligibility restrictions on the health program.

The plaintiffs, Kentucky Medicaid recipients with ages ranging from 20 to 62, represented by the Southern Poverty Law Center and other advocacy groups, are accusing the administration of “threatening irreparable harm to the health and welfare of the poorest and most vulnerable in our country,” and demanding the court block the implementation of the new requirements.

The case is challenging the administration’s crusade for Medicaid work requirements on both its substance and its process, arguing that the new policies “sharply deviate from the congressionally-established requirements of the Medicaid program and vastly exceed any lawful exercise of the Secretary’s limited waiver authority.”