Chicago (AP) Gun-rights groups have already filed a lawsuit against Chicago’s handgun ban -- after a similar ban in Washington, D.C. was struck down by the Supreme Court.
The National Rifle Association is planning to go to court and challenge San Francisco's ban.
The high court ruled that Americans can keep guns at home for self-defense. It's the first time the justices ever ruled on the meaning of gun rights under the Second Amendment.
But the court also said the right to bear arms is not absolute. And the mayor of Philadelphia, Michael Nutter, says that's an “explicit statement of support” for cities that are creating “reasonable measures” targeting those who will carry weapons in order to do harm.
The San Francisco ban prevents people from carrying guns on county property -- including parks, schools and community centers. San Francisco Mayor Gavin Newsom says he wishes the justices who rejected the D.C. ban would first “spend a week in public housing.”
Chicago Mayor Richard Daley predicts that if his city's ban is overturned, there will be more violence.