text: Immediately after the Supreme Court's ruling, the NRA filed a lawsuit against the city of Chicago over its handgun ban, followed the next day by a lawsuit against the city of San Francisco over its ban of handguns in public housing.
  Brady Campaign to Prevent Gun Violence
  The Brady Campaign to Prevent Gun Violence opposed the arguments made by the plaintiffs in Parker, and filed amicus curiae against those arguments in both the District and Circuit courts.
  Paul Helmke, the president of the Brady Campaign, suggested to D.C. before the Court granted certiorari that it modify its gun laws rather than appeal to the Supreme Court. Helmke has written that if the Supreme Court upholds the Circuit court ruling, it "could lead to all current and proposed firearms laws being called into question."
  After the ruling, Paul Helmke stated that, "the classic 'slippery slope' argument", "that even modest gun control would lead down the path to a complete ban on gun ownership", "is now gone." Helmke added that, "The Court also rejected the absolutist misreading of the Second Amendment that some use to argue 'any gun, any time for anyone,' which many politicians have used as an excuse to do nothing about the scourge of gun violence in our country and to block passage of common sense gun laws."