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“As a result, no military commission can try Salim Ahmed Hamdan, the former aide to Osama bin Laden whose case was before the justices, or anyone else, unless the president does one of two things he has resisted doing for more than four years: operate the commissions by the rules of regular military courts-martial, or ask Congress for specific permission to proceed differently... Brushing aside administration pleas not to second-guess the commander in chief during wartime, a five-justice majority ruled that the commissions, which were outlined by Bush in a military order on Nov. 13, 2001, were neither authorized by federal law nor required by military necessity, and ran afoul of the Geneva Conventions.”