Executive powers, like legislative powers and judicial powers are limited by the Constitution. The President and the Executive Branch, just like the Congress and the Judiciary have only the powers delegated to them by the Constitution and no others. The Constitution makes the President commander-in-chief of the armed forces and of the milita when called into service of the United States. It does not give him the power to negate the Bill of Rights even if for a good cause.
See post 366.
"Bill of Rights" - for Al Queda???!! unbelievable!!