Newark Mayor Ras Baraka was arrested while trying to inspect Delaney Hall, deepening the city’s legal fight with a private prison contractor.

An immigration detention center in New Jersey is at the center of tensions between three congressional Democrats and the Trump administration after the arrest of Newark’s mayor outside the facility.

Mayor Ras Baraka of Newark, New Jersey, was arrested and detained by masked federal immigration police Friday when he joined three Democratic congressmembers set to tour a newly reopened 1,000-bed Immigration and Customs Enforcement jail run by GEO Group,