A City Council employee was detained by Immigration and Customs Enforcement officers during a scheduled check-in on Long Island on Monday, prompting widespread criticism from city and state leaders.

At a press conference at City Hall on Monday evening, City Council Speaker Julie Menin told reporters that the employee went in for a “routine court appointment” in Bethpage that ended with the man’s arrest by federal immigration officials. Menin said the employee was given one phone call, which he used to contact the Council’s human-resources department, informing them of his arrest. Though he was initially detained in Bethpage, he has since been moved to the detention center on Varick Street in Manhattan.

“We’re doing everything in our power to secure his immediate release,” she said.

Mayor Zohran Mamdani condemned the staffer’s arrest and called for his release from federal custody. “I am........

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