From Today's U.S. Supreme Court Decision in Boumediene v. Bush 553 U. S. ____ (2008)

And although it recognized, by entering into the 1903 Lease Agreement, that Cuba retained "ultimate sovereignty" over Guantanamo, the United States continued to maintain the same plenary control it had enjoyed since 1898. Yet the Government's view is that the Constitution had no effect there, at least as to noncitizens, because the United States disclaimed sovereignty in the formal sense of the term. The necessary implication of the argument is that by surrendering formal sovereignty over any unincorporated territory to a third party, while at the same time entering into a lease that grants total control over the territory back to the United States, it would be possible for the political branches to govern without legal constraint.

Our basic charter cannot be contracted away like this. The Constitution grants Congress and the President thepower to acquire, dispose of, and govern territory, not thepower to decide when and where its terms apply. Even when the United States acts outside its borders, its powers are not "absolute and unlimited" but are subject "to such restrictions as are expressed in the Constitution." Murphy v. Ramsey, 114 U. S. 15, 44 (1885). Abstaining from questions involving formal sovereignty and territorial governance is one thing. To hold the political branches have the power to switch the Constitution on or off at will is quite another. The former position reflects this Court's recognition that certain matters requiring political judgments are best left to the political branches. The latter would permit a striking anomaly in our tripartite system of government, leading to a regime in which Congress and the President,not this Court, say "what the law is." Marbury v. Madison, 1 Cranch 137, 177 (1803).