sentences:  Chris Cox, executive director of the NRA's Institute for Legislative Action, had indicated support of federal legislation which would repeal the D.C. gun ban.Opponents of the legislation argued that this would have rendered the Parker case moot, and would have effectively eliminated the possibility that the case would be heard by the Supreme Court.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.