October 6, 2007, hours after William Haynes was made his superior officer. Davis stated this was due to Haynes' support of water-boarding as an interrogation tactic. Davis was told by his superiors to silence his criticisms. Second tribunal After the Military Commissions Act of 2006 was signed in October 2006, new charges were sworn against Khadr on February 2, 2007. He was charged with Murder in Violation of the Law of War, Attempted Murder in Violation of the Law of War, Conspiracy, Providing Material Support for Terrorism and Spying. However, these charges did not exist in law prior to the Military Commission Act of 2006 (MCA), which postdated the time that the alleged offenses were committed, and are not recognized as war crimes in international law. Canadian attorney Dennis Edney was barred from appearing at the October arraignment, after he criticized Kuebler's efforts, stating that the military lawyer had focused his energy on lobbying Canadian authorities to have Khadr repatriated, at the cost of preparing for the actual trial. Khadr petitioned the US Supreme Court to review the legality of the military commission and his detention, but this request was denied in April 2007. On June 1, Edney said that he would not seek any plea bargain for Khadr that would likely see him serve 30 years in prison. Peter Brownback dismissed the charges three days later, stating that Khadr had been previously classified as an "enemy combatant" by his Combatant Status Review Tribunal in 2004, while the Military Commissions Act only granted him jurisdiction to rule over "Unlawful enemy combatants". On September 9, 2007, charges were reinstated against Khadr after the Court of Military Commission Review overturned Brownback's dismissal, stating that the tribunal could determine the legality of a detainee's status for itself. On October 9, Jeffrey Groharing argued that the prosecution should not be required to identify their witnesses, stating that Khadr was "certainly capable of exacting revenge" against witnesses if he were allowed the right to face his accusers. Brownback ruled that while the defense attorneys had the right to know the identity of the witnesses, that information could not be given to Khadr himself. In November, while prosecutors were "desperately" trying to introduce the 27-minute video found in the wreckage, the tape was leaked to the media by an unknown source and shown on 60 Minutes. Four months later, Kuebler stated that following conversations with the