A federal judge has ordered New York City Mayor Zohran Mamdani's administration to comply with an Immigration and Customs Enforcement subpoena, delivering a legal setback to City Hall in its standoff with federal immigration authorities. The ruling compels the Mamdani administration to produce the records ICE demanded, rejecting the city's resistance to the federal demand. The decision marks a significant victory for the Trump administration's push to force so-called sanctuary jurisdictions to cooperate with immigration enforcement. Mamdani, a democratic socialist who took office promising to shield the city's immigrant population from federal enforcement, had fought the subpoena rather than hand over the requested material. The judge's order leaves the administration with little room to maneuver short of a further appeal. The dispute is the latest flashpoint between Washington and New York over immigration policy. Federal officials have increasingly used subpoenas and court action to pry information and cooperation out of cities that limit their dealings with ICE, arguing that local obstruction hampers public safety and the enforcement of federal law. For New Yorkers, the ruling signals that the city's sanctuary posture will face sustained legal pressure from the federal government — and that the courts, at least in this instance, are not buying the administration's arguments for withholding records. Taxpayers, meanwhile, foot the bill for the legal fight. The mayor's office has not indicated whether it will appeal. The order stands as a warning to other jurisdictions weighing whether to defy federal subpoenas: the administrative state's stonewalling has limits, and a judge can and will enforce them.