WASHINGTON — Months before two fatal shootings in Minneapolis by Border Patrol agents, Gregory Bovino, who until last week was overseeing the agency’s immigration enforcement operations, pushed back against internal efforts to temper his aggressive approach, according to an email that was obtained by NBC News. Bovino wanted to conduct large-scale immigration sweeps during an operation in Chicago in September , but the acting director of Immigration and Customs Enforcement, Todd Lyons, told him