What was the bush doctrine?

The Bush Doctrine was a doctrine of preemption that involved both a major assertion of Presidential authority and potentially lowering the threshold of war.

In simple terms its a belief that the Unites States had the right to remove perceived threats

A policy adopted by the Bush administration in 2001 that asserts America's right to attack any nation that has weapons of mass destruction that might be used against U. S. interests at home or abroad.