http://en.wikipedia.org/wiki/Japanese_American_internment#Legal_legacy
Former Supreme Court Justice Tom C. Clark, who represented the US Department of Justice in the "relocation," writes in the epilogue to the 1992 book Executive Order 9066: The Internment of 110,000 Japanese Americans:
The truth is—as this deplorable experience proves—that constitutions and laws are not sufficient of themselves...Despite the unequivocal language of the Constitution of the United States that the writ of habeas corpus shall not be suspended, and despite the Fifth Amendment's command that
no person shall be deprived of life, liberty or property without due process of law, both of these
constitutional safeguards were denied by military action under Executive Order 9066.
No stretch to apply this to Edward Snowden.