Emanuel made the disclosure Friday, while being interviewed for a Chicago radio program. The full interview is scheduled to air Sunday evening on WLS radio in Chicago, the Chicago Tribune reported.
The mayor, a Democrat who previously served as a congressman and as White House chief of staff under President Barack Obama, said the federal lawsuit will be filed Monday.
The suit will claim that it’s illegal for Attorney General Jeff Sessions to withhold federal Byrne grants from cities the Trump administration believes aren’t cooperating enough with U.S. Immigration and Customs Enforcement officials, the mayor said.