A Bridgeport man refused to leave City Hall after regular business hours, telling officers it was his "moral obligation" to stop next month's NATO summit, police said.

Jospeh Cohen, 60, was approached by police around 6:30 p.m. Monday and told several times to leave, police said.

Cohen refused, telling the officers “it is my moral obligation not to leave and to stop NATO from coming to Chicago,’’ according to a police report.

Cohen, of the 3300 block of South Halsted Street, was charged with misdemeanor trespassing, police said.

Police said they searched City Hall with dogs Tuesday evening because someone thought they saw Cohen again. But he was not found.

rsobol@tribune.com

Twitter:@RosemarySobol1