"We are finding terrorists and bringing them to justice," Bush said at a news conference with Panamanian President Martin Torrijos. "We are gathering information about where the terrorists might be hiding. We are trying to disrupt their plots and plans. Anything we do ... to that end in this effort, any activity we conduct, is within the law." (my italics.)
There is no set of "war powers" that allows Mister Bush--or any United States president--to break Constitutional or treaty law in pursuit of an enemy.
What do you reckon makes Mister Bush think there is?