At issue is whether the constitution's second amendment applies to state and local gun laws. Mayor Daley, prosecutors and families of gun victims are in Washington D.C. Tuesday to outline what they plan to argue before the justices.
"In this day and age when we think the right to bear arms in all of our communities that means any type of weapon. I don't think our founding fathers believed that these type of weapons would be on the street and to me every jurisdiction have a right to talk about the health and safety of their communities," said Mayor Daley.
In 2008, the Supreme Court overturned a similar handgun ban in Washington D.C. but the court did not address whether the second amendment also limits the authority of state governments and municipalities.