Ex parte Merryman
Facts
Merryman, a Maryland citizen, alleged that armed forces entered his home at night, seized him without warrant, and confined him at Fort McHenry. General Cadwalader's return did not deny those facts and stated that Merryman had been arrested by order of General Keim and placed in Cadwalader's custody. No specific offense supported by oath was alleged; instead, Merryman appeared to have been arrested on general charges of treason and rebellion without proof, named witnesses, or specified acts. Cadwalader refused to produce Merryman on habeas corpus, asserting authority from the President to suspend the writ.
Issue
May the President of the United States suspend the privilege of the writ of habeas corpus, or delegate that discretionary power to a military officer, so that the officer may refuse obedience to judicial process and detain a civilian without due process of law? Also, may the military arrest and imprison a civilian where the civil courts and officers are open and available?
Rule
The constitutional power to suspend the privilege of the writ of habeas corpus is a legislative power located in Article I and belongs exclusively to Congress, to be exercised only in cases of rebellion or invasion when the public safety may require it. The President has no constitutional authority to suspend the writ, to delegate such authority to military officers, or to arrest and imprison civilians except in aid of the judicial power; civilians are protected by the constitutional requirements of due process, warrants supported by oath or affirmation, and criminal process in the civil courts.
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Under the governing rule of the majority opinion, is the military detention lawful?