Congress has the power "To declare War"; the President is "Commander in Chief." You saw the war powers debate in Civics and Government. The courts rarely decide whether a war is lawful, but they have decided many cases about what the government may do to people during wartime. Read these cases for how much they depend on whether Congress authorized the action.
| Case | Question | Holding |
|---|---|---|
| The Prize Cases (1863) | Could Lincoln blockade Southern ports before Congress acted? | Yes: the President may respond to an attack or rebellion without waiting for a declaration. |
| Ex parte Milligan (1866) | Could a military commission try a civilian in Indiana, where civil courts were open? | No. |
| Hamdi v. Rumsfeld (2004) | What process is due a U.S. citizen held as an enemy combatant? | Congress's 2001 Authorization for Use of Military Force allowed detention, but the citizen must get notice and a fair chance to rebut before a neutral decisionmaker. |
| Hamdan v. Rumsfeld (2006), 5 to 3 | Were the Guantanamo military commissions lawful? | No: they were not authorized by Congress and violated the laws of war as Congress had adopted them. |
| Boumediene v. Bush (2008), 5 to 4 | Do Guantanamo detainees have the constitutional privilege of habeas corpus? | Yes: the Suspension Clause reaches Guantanamo, and Congress had not provided an adequate substitute. |
Why it works
Why focus on Congress? Under Youngstown, presidential power is strongest with Congress's support. In Hamdi, the AUMF supplied authorization to detain. In Hamdan, the commissions failed because Congress had not authorized them in the form the President chose. After Hamdan, Congress passed the Military Commissions Act of 2006, and the next question, in Boumediene, was whether Congress could remove habeas corpus. So the cases were mostly a conversation among the three branches, not a free hand for one.
Key idea
The Prize Cases (1863) upheld Lincoln's blockade before Congress acted. After 2001: Hamdi (2004) required due process for a citizen held as an enemy combatant; Hamdan (2006) held the military commissions unauthorized; Boumediene (2008) extended habeas corpus to Guantanamo.
Worked example: Following the branches in the Guantanamo cases
Trace the back-and-forth from 2004 to 2008.
- 2004: Hamdi requires due process for citizens; Rasul v. Bush (same day) reads the habeas statute to reach Guantanamo.
- 2005–2006: Congress passes laws limiting detainee habeas cases; Hamdan holds the commissions unauthorized.
- 2006: Congress passes the Military Commissions Act, authorizing commissions and removing habeas jurisdiction.
- 2008: Boumediene holds the Constitution's habeas privilege applies, so Congress must provide an adequate substitute or suspend the writ.
Answer: Each decision prompted a response by Congress, and each statute shaped the next case.
Worked example: The War Powers Resolution
Congress passed the War Powers Resolution in 1973, over President Nixon's veto. What does it require, and is it settled law?
- The President must report to Congress within 48 hours of introducing forces into hostilities and must end their use within 60 days (plus up to 30 days for withdrawal) unless Congress authorizes it.
- Presidents of both parties have said it unconstitutionally limits the Commander-in-Chief power, while generally filing the reports.
- The courts have not resolved the dispute, often treating such suits as nonjusticiable.
Answer: It is a statute both branches cite and contest; its constitutionality has never been decided by the Supreme Court.
Common mistake
Thinking the Court gave the President a free hand in wartime. These cases mostly turned on whether Congress had authorized the action and on the Constitution's procedural protections (due process, habeas corpus). Check what Congress had said before reading the holding.
This is an educational course, not legal advice.