lawlessness or the depredations of a tyrannical government (or a threat from abroad)." They also noted that though the right to bear arms also helped preserve the citizen militia, "the activities [the Amendment] protects are not limited to militia service, nor is an individual's enjoyment of the right contingent upon his or her continued or intermittent enrollment in the militia." The court determined that handguns are "Arms" and concluded that thus they may not be banned by the District of Columbia. The court also struck down the portion of the law that requires all firearms including rifles and shotguns be kept "unloaded and disassembled or bound by a trigger lock." The District argued that there is an implicit self-defense exception to these provisions, but the D.C. Circuit rejected this view, saying that the requirement amounted to a complete ban on functional firearms and prohibition on use for self-defense: In her dissent, Circuit Judge Henderson stated that Second Amendment rights did not extend to residents of District of Columbia, writing: In April 2007, the District and Mayor Adrian Fenty petitioned for rehearing en banc, arguing that the ruling created inter- and intra-jurisdictional conflict. On May 8, the Court of Appeals for the D.C. Circuit denied the request to rehear the case, by a 6–4 vote. Supreme Court The defendants petitioned the United States Supreme Court to hear the case. The Supreme Court granted certiorari on November 20, 2007. The court rephrased the question to be decided as follows: This represented the first time since the 1939 case United States v. Miller that the Supreme Court had directly addressed the scope of the Second Amendment. Amicus curiae briefs Because of the controversial nature of the case, it garnered much attention from many groups on both sides of the gun rights issue. Many of those groups filed amicus curiae (friend of the court) briefs, about 47 urging the court to affirm the case and about 20 to remand it. A majority of the members of Congress signed the brief authored by Stephen Halbrook advising that the case be affirmed overturning the ban on handguns not otherwise restricted by Congress. Vice President Dick Cheney joined in this brief, acting in his role as President of the United States Senate, and breaking with the George W. Bush administration's official position. Arizona Senator John McCain, Republican, also signed the brief. Then-Illinois Senator Barack Obama did not.