CHICAGO, IL - DECEMBER 07: Interim Chicago Police Superintendant John Escalante (L) listens as Mayor Rahm Emanuel takes questions during a press conference on December 7, 2015 in Chicago, Illinois. Escalante replaced Garry McCarthy after he was fired by the mayor. The mayor, the police department and the Cook County state's attorney's office have been under fire since a video was released showing 17-year-old Laquan McDonald being shot and killed by Chicago police officer Jason Van Dyke. Van Dyke was charged with murder more than a year after the shooting based in part on a police video which showed McDonald backing away from Van Dyke while being shot. Many feel the delay in Van Dyke being charged was due to the administration trying to cover up the shooting. Today U.S. Attorney General Loretta Lynch announced the justice department was going to open an investigation into the Chicago Police Department. (Photo by Scott Olson/Getty Images)

CHICAGO, IL - DECEMBER 07:  Interim Chicago Police Superintendant John Escalante (L) listens as Mayor Rahm Emanuel takes questions during a press conference on December 7, 2015 in Chicago, Illinois. Escalante replaced Garry McCarthy after he was fired by the mayor. The mayor, the police department and the Cook County state's attorney's office have been under fire since a video was released showing 17-year-old Laquan McDonald being shot and killed by Chicago police officer Jason Van Dyke. Van Dyke was charged with murder more than a year after the shooting based in part on a police video which showed McDonald backing away from Van Dyke while being shot. Many feel the delay in Van Dyke being charged was due to the administration trying to cover up the shooting. Today U.S. Attorney General Loretta Lynch announced the justice department was going to open an investigation into the Chicago Police Department.  (Photo by Scott Olson/Getty Images)