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A single, fiercely debated legal principle lies behind nearly every major initiative in the Bush administration's war on terror, scholars say: the sweeping assertion of the powers of the presidency. From the government's detention of Americans as "enemy combatants" to the just-disclosed eavesdropping in the United States without court warrants, the administration has relied on an unusually expansive interpretation of the president's authority. That stance has given the administration leeway for decisive action, but it has come under severe criticism from some scholars and the courts.
With the strong support of Vice President Dick Cheney, legal theorists in the White House and Justice Department have argued that previous presidents unjustifiably gave up some of the legitimate power of their office. The attacks of Sept. 11, 2001, made it especially critical that the full power of the executive be restored and exercised, they said. The administration's legal experts, including David S. Addington, the vice president's former counsel and now his chief of staff, and John C. Yoo, deputy assistant attorney general in the Office of Legal Counsel of the Justice Department from 2001 to 2003, have pointed to several sources of presidential authority. The bedrock source is Article 2 of the Constitution, which describes the "executive power" of the president, including his authority as commander in chief of the armed forces. Several landmark court decisions have elaborated the extent of the powers.
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"Any program like this would have been very carefully analyzed by administration lawyers," Mr. Berenson said. "It's easy, now that four years have passed without another attack, to forget the sense of urgency that pervaded the country when the ruins of the World Trade Center were still smoking." But some legal experts outside the administration, including some who served previously in the intelligence agencies, said the administration had pushed the presidential-powers argument beyond what was legally justified or prudent. They say the N.S.A. domestic eavesdropping illustrates the flaws in Mr. Bush's assertion of his powers. "Obviously we have to do things differently because of the terrorist threat," said Elizabeth Rindskopf Parker, former general counsel of both N.S.A. and the Central Intelligence Agency, who served under both Republican and Democratic administrations. "But to do it without the participation of the Congress and the courts is unwise in the extreme."
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http://www.nytimes.com/2005/12/17/politics/17legal.html?hp&ex=1134795600&en=3fb2a61c1230f802&ei=5094&partner=homepage