The Coalition for Humane Immigrant Rights, the United Farm Workers of America, CASA, Inc., and Make the Road New York sued the Trump administration for issuing a rule that requires noncitizens to register with the federal government and carry proof of their registration, or risk criminal prosecution. The administration issued the rule as a “procedural rule” without soliciting and addressing public comments. The plaintiffs argue that the rule is not procedural because it burdens and affects millions of people, and thus was issued in violation of the Administrative Procedure Act. The plaintiffs seek vacatur of the rule.