Glenn Greenwald hits the nail on the head again:

Of all the constitutionally threatening and extremist powers the Bush administration has asserted over the last seven years, the most radical — and the most dangerous — has been its claim that the President has the power to arrest U.S. citizens and legal residents inside the U.S., and imprison them indefinitely in a military prison, without charging them with any crime, based on his assertion that the imprisoned individual is an “enemy combatant.”

This is an excellent, detailed read at Salon.com.