New York City Comptroller and Democratic mayoral candidate Brad Lander was arrested Tuesday at immigration court in Manhattan.

Lander’s office said he was taken into custody by U.S. Immigration and Customs Enforcement agents while observing court, where he asked for a judicial warrant in a particular case.”While escorting a defendant out of immigration court at 26 Federal Plaza, Brad was taken by masked agents and detained by ICE. This is still developing and we are monitoring the situation closely,” Lander’s campaign spokesperson, Dora Pekec, said in a statement.Video from the courthouse showed Lander being placed into handcuffs.”You don’t have the authority to arrest U.S. citizens asking for a judicial warrant,” he could be heard saying during his arrest.