Trotter, clad in a brown sweater with his trademark bow tie, stood silently as Judge Ann O'Donnell handed down the ruling after a brief preliminary hearing at a branch courthouse on the Northwest Side.
Trotter’s lawyer, Thomas Anthony Durkin, told reporters after the hearing that his client shouldn't be penalized for doing something "unknowingly."
"I thought the evidence was very favorable to us," Durkin said. "This is just the next step in the case. We're not horribly concerned. ... I'm very confident going forward."
Trotter, 62, was charged with trying to board a jet on Dec. 5 at O'Hare International Airport after Transportation Security Administration officials at a security checkpoint spotted the handgun in a zipped-up side pocket of his carry-on garment bag.
He told police he got off work as a security guard and forgot that his gun and a magazine containing six live rounds was in the bag.
Trotter's next court date was scheduled for March 12 at the George Leighton Criminal Court Building.