Enough in terms of what? Should we just go to war against everybody that disagrees with us? Is that how international law works? Is the worry that they might one day have a nuclear weapon? The US has thousands of them already and no nation could ever have nuclear parity with us. If the US does not go bankrupt in the wars it already has on its hands, you can expect that we will probably put an economic embargo on Iran and soften it up over the years with air attacks. When Iran is weak enough from all this (and if we have enough financial credit left), we will probably invade Iran and it will go just like Vietnam, Iraq, and Afghanistan.