The President is Commander in Chief of the military forces during peacetime and wartime. This gives the President certain powers regarding the detention and trial of prisoners of war and enemy combatants.
Article II, Section 2, Clause 1 of the United States Constitution gives the president the following power:
The President shall be Commander in Chief of the Army and Navy of the United States, and of the Militia of the several States, when called into the actual Service of the United States; he may require the Opinion, in writing, of the principal Officer in each of the executive Departments, upon any Subject relating to the Duties of their respective Offices, and he shall have Power to grant Reprieves and Pardons for Offences against the United States, except in Cases of Impeachment.
United States Library of Congress, The Constitution of the United States of America: Analysis and Interpretation
In 1942 eight youths, seven Germans and one an American, all of whom had received training in sabotage in Berlin, were brought to this country aboard two German submarines and put ashore, one group on the Florida coast, the other on Long Island, with the idea that they would proceed forthwith to practice their art on American factories, military equipment, and installations. Making their way inland, the saboteurs were soon picked up by the FBI, some in New York, others in Chicago, and turned over to the Provost Marshal of the District of Columbia. On July 2, the President appointed a military commission to try them for violation of the laws of war, to wit: for not wearing fixed emblems to indicate their combatant status. In the midst of the trial, the accused petitioned the Supreme Court and the United States District Court for the District of Columbia for leave to bring habeas corpus proceedings. Their argument embraced the contentions: (1) that the offense charged against them was not known to the laws of the United States; (2) that it was not one arising in the land and naval forces; and (3) that the tribunal trying them had not been constituted in accordance with the requirements of the Articles of War.
The first argument the Court met as follows: The act of Congress in providing for the trial before military tribunals of offenses against the law of war is sufficiently definite, although Congress has not undertaken to codify or mark the precise boundaries of the law of war, or to enumerate or define by statute all the acts which that law condemns. ". . . [T]hose who during time of war pass surreptitiously from enemy territory into . . . [that of the United States], discarding their uniforms upon entry, for the commission of hostile acts involving destruction of life or property, have the status of unlawful combatants punishable as such by military commission."1 The second argument it disposed of by showing that petitioners' case was of a kind that was never deemed to be within the terms of the Fifth and Sixth Amendments, citing in confirmation of this position the trial of Major Andre.2 The third contention the Court overruled by declining to draw the line between the powers of Congress and the President in the premises,3 thereby, in effect, attributing to the President the right to amend the Articles of War in a case of the kind before the Court ad libitum.
The decision might well have rested on the ground that the Constitution is without restrictive force in wartime in a situation of this sort. The saboteurs were invaders; their penetration of the boundary of the country, projected from units of a hostile fleet, was essentially a military operation, their capture was a continuation of that operation. Punishment of the saboteurs was therefore within the President's purely martial powers as Commander in Chief. Moreover, seven of the petitioners were enemy aliens, and so, strictly speaking, without constitutional status. Even had they been civilians properly domiciled in the United States at the outbreak of the war, they would have been subject under the statutes to restraint and other disciplinary action by the President without appeals to the courts. In any event, the Court rejected the jurisdictional challenge by one of the saboteurs on the basis of his claim to U.S. citizenship, finding U.S. citizenship wholly irrelevant to the determination of whether a wartime captive is an "enemy belligerent" within the meaning of the law of war.4
As a matter of fact, in General Yamashita's case,5 which was brought after the termination of hostilities for alleged "war crimes," the Court abandoned its restrictive conception altogether. In the words of Justice Rutledge's dissenting opinion in this case: "The difference between the Court's view of this proceeding and my own comes down in the end to the view, on the one hand, that there is no law restrictive upon these proceedings other than whatever rules and regulations may be prescribed for their government by the executive authority or the military and, on the other hand, that the provisions of the Articles of War, of the Geneva Convention and the Fifth Amendment apply."6 And the adherence of the United States to the Charter of London in August 1945, under which the Nazi leaders were brought to trial, is explicable by the same theory. These individuals were charged with the crime of instigating aggressive war, which at the time of its commission was not a crime either under international law or under the laws of the prosecuting governments. It must be presumed that the President is not in his capacity as Supreme Commander bound by the prohibition in the Constitution of ex post facto laws, nor does international law forbid ex post facto laws.7
In response to the September 11, 2001, terrorist attacks on New York City's World Trade Center and the Pentagon in Washington, D.C., Congress passed the "Authorization for Use of Military Force,"8 which provided that the President may use "all necessary and appropriate force against those nations, organizations, or persons he determines planned, authorized, committed or aided the terrorist attacks [or] harbored such organizations or persons." During a military action in Afghanistan pursuant to this authorization, a United States citizen, Yaser Hamdi, was taken prisoner. The Executive Branch argued that it had plenary authority under Article II to hold such an "enemy combatant" for the duration of hostilities, and to deny him meaningful recourse to the federal courts. In Hamdi v. Rumsfeld, the Court agreed that the President was authorized to detain a United States citizen seized in Afghanistan, although a majority of the Court appeared to reject the notion that such power was inherent in the Presidency, relying instead on statutory grounds.9 However, the Court did find that the government may not detain the petitioner indefinitely for purposes of interrogation, and must afford him the opportunity to offer evidence that he is not an enemy combatant.10
In Rasul v. Bush,11 the Court rejected an Executive Branch argument that foreign prisoners being held at Guantanamo Bay were outside of federal court jurisdiction. The Court distinguished earlier case law arising during World War II that denied habeas corpus petitions from German citizens who had been captured and tried overseas by United States military tribunals.12 In Rasul, the Court noted that the Guantanamo petitioners were not citizens of a country at war with the United States,13 had not been afforded any form of tribunal, and were being held in a territory over which the United States exercised exclusive jurisdiction and control.14 In addition, the Court found that statutory grounds existed for the extension of habeas corpus to these prisoners.15, which had previously been construed to require the presence of a petitioner in a district court's jurisdiction, was now satisfied by the presence of a jailor-custodian.
In response to Rasul, Congress amended the habeas statute to eliminate all federal habeas jurisdiction over detainees, whether its basis was statutory or constitutional.16 This amendment was challenged in Boumediene v. Bush,17 as a violation of the Suspension Clause.18 Although the historical record did not contain significant common-law applications of the writ to foreign nationals who were apprehended and detained overseas, the Court did not find this conclusive in evaluating whether habeas applied in this case.19 Emphasizing a "functional" approach to the issue,20 the Court considered (1) the citizenship and status of the detainee and the adequacy of the process through which the status determination was made; (2) the nature of the sites where apprehension and detention took place; and (3) any practical obstacles inherent in resolving the prisoner's entitlement to the writ. As in Rasul, the Court distinguished previous case law, noting that the instant detainees disputed their enemy status, that their ability to dispute their status had been limited, that they were held in a location (Guantanamo Bay, Cuba) under the de facto jurisdiction of the United States, and that complying with the demands of habeas petitions would not interfere with the government's military mission. Thus, the Court concluded that the Suspension Clause was in full effect regarding these detainees.