Hamdan v. Rumsfeld
The Supreme Court struck down the military commission President Bush created to try Guantanamo Bay detainee Salim Hamdan, ruling that its structure and procedures violated both a military justice law passed by Congress and the Geneva Conventions.
The decision rejected the administration's claim that the President could set up his own war-crimes tribunals largely free of congressional and international limits, reaffirming that even in fighting terrorism, the executive branch must follow the rule of law Congress and treaties have established.
“But in undertaking to try Hamdan and subject him to criminal punishment, the Executive is bound to comply with the Rule of Law that prevails in this jurisdiction.”
The Court's closing statement that even wartime tribunals must follow legal limits.
How it got here: A federal district court granted Hamdan habeas relief and halted his trial; the D.C. Circuit reversed; the Supreme Court then agreed to review that decision.
The Case in Depth
What happened
Salim Hamdan, a Yemeni national captured in Afghanistan in 2001, was held at Guantanamo Bay and, years later, charged with conspiracy for having worked as Osama bin Laden's driver and bodyguard. Rather than face a court-martial or civilian trial, he was slated to be tried before a military commission the President created by executive order to handle terrorism suspects.
The question before the Court
Could the President put a Guantanamo detainee on trial before a special military commission he created himself, without specific approval from Congress?
Why it matters
The ruling forced the Bush administration to go back to Congress, which led to a new law (the Military Commissions Act) governing detainee trials. It also confirmed that a basic Geneva Convention protection — trial before a properly constituted court with fair procedures — applies to detainees held in the war on terror, shaping how the U.S. handles terrorism suspects to this day.
What changes now
Because the Court found the commission unauthorized, Hamdan could not be tried before it as constituted, and the case was sent back for further proceedings. The ruling pushed the administration to seek explicit authorization from Congress, which passed the Military Commissions Act of 2006 later that year to create a new, statutorily authorized system for trying detainees. This is a final merits decision, not a temporary order.
What this does not decide
The Court did not decide whether Hamdan could be detained for the duration of hostilities, nor whether the President has any independent constitutional power to convene commissions without congressional authorization. Four justices (not a full majority) also addressed whether conspiracy itself is a war crime; Justice Kennedy's concurrence, needed for the majority, did not join that part.
Concurrences and dissents
Concurrence — Justice Breyer
Justice Breyer emphasized that the Court's ruling rested on a narrow point: Congress had not given the President a 'blank check' to create these commissions. He stressed that nothing stops the President from returning to Congress to seek the specific authority needed, and that requiring this consultation strengthens rather than weakens the nation's ability to respond to danger.
Concurrence in part — Justice Kennedy
Justice Kennedy agreed the commission was unauthorized under military justice statutes and the Geneva Conventions but declined to join the parts of the opinion addressing whether Common Article 3 requires the accused's presence at all times or whether the conspiracy charge itself was invalid. He focused on structural flaws, such as the President's Appointing Authority holding excessive control over commission decisions, and concluded no practical need justified departing from court-martial practice.
Dissent — Justice Scalia
“the plain import of a statute repealing jurisdiction is to eliminate the power to consider and render judgment—in an already pending case no less than in a case yet to be filed.”Scalia's argument that the Court lacked jurisdiction to hear the case at all.
Justice Scalia argued the Court lacked jurisdiction at all because a new law unambiguously stripped courts of power to hear pending Guantanamo habeas cases the moment it was enacted, and that the majority's reliance on legislative history to reach the opposite conclusion was illegitimate. He also argued that, even with jurisdiction, the Court should have deferred to the ongoing military proceedings under equitable abstention principles.
Dissent — Justice Thomas
Justice Thomas argued the majority owed far greater deference to the President's wartime judgments, contending that Hamdan's alleged conduct—joining and aiding al Qaeda's terrorist enterprise—was plainly triable as a war crime under historical practice, and that Common Article 3 either didn't apply or was satisfied by the commission's procedures. He accused the majority of improperly second-guessing military necessity determinations reserved to the political branches.
Dissent — Justice Alito
Justice Alito focused narrowly on disputing the majority's reading of 'regularly constituted court,' arguing that a tribunal need only be properly established under domestic law to qualify, regardless of whether it structurally resembles a court-martial, and that any specific procedural unfairness could be addressed case-by-case on appeal rather than by invalidating the whole commission system.
How the Court got there
The legal reasoning, step by step
- The Court first rejected the government's argument that a newly passed law, the Detainee Treatment Act, had stripped courts of jurisdiction over Hamdan's already-pending case, reasoning that Congress's choice to apply some provisions to pending cases but not others showed a deliberate decision not to cut off this case.
- It then declined to abstain from deciding the case under a doctrine that normally tells civilian courts to let military trials finish first, explaining that doctrine exists to protect military discipline over service members and an established appellate system — neither of which applied to Hamdan, a civilian-status detainee facing a one-off tribunal.
- Turning to authority, the Court found that no law specifically approved the commission the President created; a military justice provision (UCMJ Article 21) let Presidents use commissions only for offenses the 'law of war' recognizes, and Congress's post-9/11 authorization to use military force did not expand that authority.
- The Court held that the commission's own procedures — allowing Hamdan to be excluded from portions of his trial and barred from seeing some evidence used against him — deviated from court-martial rules without any showing that following those rules was impracticable, violating a UCMJ provision (Article 36) requiring uniform procedures unless practicality demands otherwise.
- Finally, the Court concluded that Common Article 3 of the Geneva Conventions, which requires trial by a 'regularly constituted court' offering guarantees civilized peoples consider indispensable, applied to the conflict with al Qaeda and that a commission built around procedures departing from court-martial practice without practical justification failed that standard.
Doctrinal impact
Cases affected by this decision
Limits Ex parte Quirin (317 U. S. 1)
Clarified that Quirin never gave Presidents unlimited power to create commissions whenever deemed necessary.
Distinguishes Johnson v. Eisentrager (339 U. S. 763)
Held Eisentrager's footnote on Geneva Convention enforcement did not bar Hamdan's claim under the law of war.
Limits In re Yamashita (327 U. S. 1)
Found that later treaty and statutory changes stripped Yamashita's procedural approach of continuing precedential force.