Three organizations opposing profound changes to Kentucky’s Medicaid program filed a lawsuit Wednesday to block the nation’s first experiment to compel low-income people to work or otherwise engage in their communities to qualify for the safety-net health insurance. The federal lawsuit, lodged on behalf of 15 Kentuckians at risk of losing coverage and medical care, alleges that the federal health officials who approved the plan acted illegally and in conflict with Medicaid law that only Congress has power to change. The 80-page complaint contends that, in granting Kentucky a “waiver” from regular Medicaid rules, the Trump administration has “effectively rewritten the statute … overturning a half-century of administrative practice, and threatening irreparable harm to the health and welfare of the poorest and most vulnerable in our country.” The suit was filed by the National Health Law Program, the Kentucky Equal Justice Center and the Southern Poverty Law Center.