Federal agents detained city's chief finance officer Brad Lander as he guided a defendant out of immigration court on Tuesday.

New York City comptroller and Democratic mayoral candidate Brad Lander was handcuffed, detained and led away by masked agents at immigration court on Tuesday.

Video taken by reporters at the courthouse show Mr. Lander standing by a migrant man in a crowded hallway when several men who appear to be law enforcement officers, some wearing masks, walk up to the...