State's Attorney Eileen O'Neill Burke attends the 2025 Machine Gun Conversion Device Summit in June 2025. [Cook County State's Attorney's Office]

A couple weeks after Mayor Brandon Johnson issued an executive order that directs the Chicago Police Department (CPD) to investigate potential crimes committed by Immigration and Customs Enforcement (ICE) and other federal immigration agents in the course of their duties and refer them to the state’s attorney’s office for possible prosecution, the state’s attorney’s office has issued its own guidance after questioning the viability of the mayor’s directive. 

Cook County State’s Attorney Eileen O’Neill Burke’s office said the new guidance, dubbed the Federal Immigration Enforcement Action Response Protocol, became effective Thursday.