New Jersey’s top federal prosecutor said Monday that she’s charging Democratic Rep. LaMonica McIver with assault after a skirmish with federal officers who arrested the Newark mayor outside an immigration detention center.

Federal prosecutors allege that on May 9, McIver, who represents New Jersey’s 10th Congressional District, forcibly struck and obstructed two federal agents during a confrontation at Delaney Hall, an Immigration and Customs Enforcement (ICE) detention center used by the Department of Homeland Security.

Democratic Rep. LaMonica McIver is charged with assaulting two officers in clash at New Jersey ICE detention center, a highly unusual move by the Justice Department.