Acting U.S. Attorney for New Jersey Alina Habba announced the grand jury indictment in a post on X.
"While people are free to express their views for or against particular policies, they must not do so in a manner that endangers law enforcement and the communities those officers serve," Habba said.
McIver, a Democrat, had been charged in a complaint by Habba last month with two assault charges stemming from the May 9 visit to Newark's Delaney Hall — a 1,000-bed, privately owned facility that Immigration and Customs Enforcement uses as a detention center.
McIver disputed the allegations as baseless and defended her presence at the facility as part of her authorized role as a member of Congress.