Bush Doctrine
From dKosopedia
To forestall or prevent such hostile acts by our adversaries, the United States will, if necessary, act preemptively. The United States will not use force in all cases to preempt emerging threats, nor should nations use preemption as a pretext for aggression. Yet in an age where the enemies of civilization openly and actively seek the world's most destructive technologies, the United States cannot remain idle while dangers gather.
See shifting meaning of "The Bush Doctrine" regarding an attempt to redefine the Bush Doctrine at the beginning of President G.W. Bush's second term.
[http://www.aei.org/publications/pubID.15845/pub_detail.asp The Underpinnings of the Bush Doctrine] By Thomas Donnelly. NATIONAL SECURITY OUTLOOK January 31, 2003.