Brad Lander, who wants to be the mayor of New York, was arrested by police at an immigration court. He was watching court cases there. When the police tried to arrest a man, Lander held his arm and asked to see a paper from a judge. The police pulled them apart and arrested Lander. After he was free, Lander said he was against the immigration rules and was not violent. Other people who want to be mayor and other politicians said the arrest was bad.