You don't need to look further than Iraq to see that the Bush administration's dangerous doctrine of preemption is a failure that we cannot afford to repeat with Iran. Congress has neglected its oversight of this failed policy, and we must force a debate on this issue. If our goal is to stop Iran from acquiring a nuclear weapon, then that is what our policies should be designed to do. We need to drop the preconditions for diplomacy and remove regime change from the table.