On November 23, 2009, an amicus brief was filed on behalf of CLDEF in the case of Otis McDonald v. City of Chicago in the United States Supreme Court in support of petitioners’ challenge to an ordinance banning handguns in Chicago. The amicus brief argues that the Chicago handgun ban unconstitutionally abridges petitioners’ right to keep and bear arms, a privilege or immunity belonging to them as United States citizens protected by the Fourteenth Amendment. It also explains that no wholesale change in the Supreme Court’s Fourteenth Amendment jurisprudence is required to rule that the Chicago ordinance unconstitutionally abridges petitioners’ right to keep and bear arms. Further, it asserts that incorporation of the right to keep and bear arms into the Due Process Clause would result in weak and potentially transitory protection of that right.