Bush: U.S. Will Strike First
"President Bush told future Army officers today that the United States can no longer deter attacks from other nations by threatening massive retaliation, but instead must strike looming enemies first.
He said that not only will the United States impose preemptive, unilateral military force when and where it chooses, but the nation will also punish those who engage in terror and aggression and will work to impose a universal moral clarity between good and evil."

So basically, you don't have to actually do anything before America will fight back. We can attack on the premise that you might eventually threaten us. I think we need to impeach Bush now -- he might abuse his power eventually, and we need to be preemptive.