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Assassination attempts targeting populist leaders have had a track record of boosting their popularity.
City Hall said the move had been made out of an abundance of caution, and that there were no known ties or threats to New York City.
In 2022, Kavanagh became the first female FDNY commissioner in the department's history.
The lawsuit was filed in U.S. District Court on Friday and accuses the city of suppressing speech criticizing the government during the high-profile event.