Details of planned immigration raids are unclear, but they would be the opening step in the president-elect’s goal of overseeing the largest deportation program in history.

Immigrants in large cities have been preparing for mass arrests since Trump won election in November, but reports that his initial push would be in the Chicago area has brought a new sense of urgency and fear.

San Diego and Chicago leaders have vowed to defy Tom Homan by protecting undocumented migrants from deportation.