Jussie Smollett told Chicago police he had fought off a pair of attackers who targeted him in an apparent hate crime, Cook County State’s Attorney Kim Foxx tried to persuade Police Supt. Eddie Johnson to turn the investigation over to the FBI. Foxx’s call came after an influential supporter of the “Empire” actor reached out to Foxx personally: Tina Tchen, a Chicago attorney and former chief of staff for Michelle Obama, according to emails and text messages provided to the Chicago Sun-Times in response to a public records request. Tchen passed Foxx’s number to a relative of the actor, and...