Brad Lander, who wants to be the mayor of New York, was arrested by police at a court for immigrants. He was watching court cases there. When the police tried to take a man, Lander held his arm. He asked to see a paper from the court. The police separated them and arrested Lander. After he was let go, Lander said he was trying to show he did not agree with the government's rules about people coming into the country, and he did it in a peaceful way. Other politicians from his party are not happy about his arrest.