Salim Ahmed Hamdan, Osama bin Laden's former chauffeur, was captured by Afghani forces and imprisoned by the U.S. military in Guantanamo Bay. He filed a petition for a writ of habeas corpus in federal district court to challenge his detention. Before the district court ruled on the petition, he received a hearing from a military tribunal, which designated him an enemy combatant.
A few months later, the district court granted Hamdan's habeas petition, ruling that he must first be given a hearing to determine whether he was a prisoner of war under the Geneva Convention before he could be tried by a military commission. The Circuit Court of Appeals for the District of Columbia reversed the decision, however, finding that the Geneva Convention could not be enforced in federal court and that the establishment of military tribunals had been authorized by Congress and was therefore not unconstitutional.