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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
I don't think he can do that, as the UN has a deal with the US saying "you won't interfere with anyone coming to our meetings at UNHQ NY".
That being said, the ICC is a UN-level body and the UN may be obliged to follow their warrants, but AFAIK they didn't take steps to arrest or disown the genocidal maniac.
Also, the NYPD is a hive mind of conservatism, meaning they'd rather spill their own blood fighting for Trump and Bibi. Listening to socialists isn't something they're likely to do soon.