Joe Thompson, the career U.S. Justice Department attorney best known for prosecuting social services fraud in Minnesota, has resigned along with other experienced attorneys at the Minnesota U.S. Attorney’s Office.

The move comes after top Justice Department officials pushed the Minnesota U.S. Attorney’s Office to investigate the widow of Renee Macklin Good, the person shot and killed last week by ICE agent Jonathan Ross, MPR News has learned.

Thompson, 47, also objected to the DOJ’s decision to exclude the Minnesota Bureau of Criminal Apprehension from the investigation into the shooting and the department’s reluctance to investigate Ross, according to a person familiar with Thompson’s decision.

Veteran assistant U.S. attorneys Melinda Williams, Harry Jacobs, and Thomas Calhoun-Lopez also resigned. The prosecutors were also concerned that immigration enforcement is diverting resources away from prosecuting major fraud cases in the state.