In July 2012, Arizona submitted to the Supreme Court a petition for writ of certiorari to review the Ninth Circuit's ruling that the state's proof of citizenship requirement is preempted by the NVRA. The Court granted the petition in October 2012, and it heard oral arguments on March 18, 2013. On June 17, 2013, the Supreme Court affirmed, in a 7-2 vote with Justice Antonin Scalia delivering the Court's opinion, the Ninth Circuit's ruling that Arizona's proof of citizenship requirement is preempted by the NVRA.