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“My administration has reviewed every avenue available under applicable law to determine whether New York City could execute the international criminal court’s arrest warrant if Benjamin Netanyahu came here,” Mamdani said. “It is clear that we do not have the independent legal authority to enforce this warrant.
https://nitter.net/NYCMayor/status/2079718073058091261#m
https://www.theguardian.com/us-news/2026/jul/21/mamdani-benjamin-netanyahu-arrest-authority
Most (all?) criminal laws are written at the state level, not the city level. For example, NYC probably doesn't get to define what constitutes an assault, burglary, or theft within the city limits. With out-of-state warrants, usually there's a state law that allows police to (for example) arrest someone in New York for a Virginia warrant, then look at extraditing them to Virginia. I doubt it's that clean for international warrants, as U.S. states probably don't presume any international warrant is legitimate the same way they presume warrants from other U.S. states are legitimate.
Maybe there are carve outs in some cities that allow police to arrest people for violations of certain city ordinances, but a lot of minor stuff people get arrested for -- disturbing the peace, driving without a license -- are state crimes. If there is some New York law allowing NYC to create local ordinances and allow arrests based on violations, I'd be surprised if it's just blanket power to effectively create any criminal law you want (such as making it illegal for someone with an ICC warrant to enter the city).
ok, then fine him for 782138921832189321930219823912 trillion dollars. surely NYC can issue fines for breaking regulations :)