Lawyers argued their cases to the nine justices Tuesday. Two years ago, the court ruled Washington, D.C.'s ban was unconstitutional.
Now, justices must decide whether states and cities can legally prohibit handguns.
"The thing I can't understand is I can't go to the Supreme Court with a gun. Why not? Why can't I go with a gun and listen to the arguments? If a gun is so important to us on the streets. I'm just saying let cities make decisions for themselves. None of them live here in Chicago," said Daley.
Supreme Court observers say that the justices indicated, by their questions, they may overturn Chicago's handgun ban, but still allow some regulation of guns.