For five years, President Bush waged war as he saw fit. If intelligence officers needed to eavesdrop on overseas telephone calls without warrants, he authorized it. If the military wanted to hold terrorism suspects without trial, he let them.

Now the Supreme Court has struck at the core of his presidency and dismissed the notion that the president alone can determine how to defend the country. In rejecting Bush's military tribunals for terrorism suspects, the high court ruled that even a wartime commander in chief must govern within constitutional confines significantly tighter than this president has believed appropriate.

For many in Washington, the decision echoed not simply as matter of law but as a rebuke of a governing philosophy of a leader who at repeated turns has operated on the principle that it is better to act than to ask permission. This ethos is why many supporters find Bush an inspiring leader, and why many critics in this country and abroad react so viscerally against him....

"There is a strain of legal reasoning in this administration that believes in a time of war the other two branches have a diminished role or no role," Sen. Lindsey O. Graham (R-S.C.), who has resisted the administration's philosophy, said in an interview. "It's sincere, it's heartfelt, but after today, it's wrong."