I say this because deterrence is going to be even more important as a result of this deal. Indeed, for me the greatest single problem with the agreement is that Iran is going to be left as a threshold nuclear state at the end of fifteen years. The agreement requires Iran to dismantle none of its enrichment infrastructure and starting in year 15, it can have as large a nuclear program as it wants. The gap between threshold and weapons status is small and will not take long to bridge.
As such, deterrence is what will matter. Iran must have no doubts that if we see it moving toward a weapon that would trigger the use of force. Declaring that is a must even now. Proving that every transgression will produce a price will demonstrate that we mean what we say.
If verification is necessary because the agreement is not built on trust, so, too, is building the credibility of our deterrence because Iran will be a threshold nuclear state—one that has deferred but not given up the option of being a nuclear weapon state.