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The basic facts have not changed: Iran is galloping toward nuclear weapons. The Iranian clock is currently ticking at the rate of three kilograms of enriched uranium per day. Despite impressive successes in the realm of prevention, prevention is not preventing the Iranian bomb, it is merely postponing the assembly date. Delay is important, but it is not enough. Fact: Again and again, the Iranians have deceived those who are trying to thwart it. When its storehouses contain enough raw material for 30 nuclear bombs and enough semi-processed material for one bomb, the Shi'ite power is on the threshold. Its distance from full nuclear-power status ranges from one year in the worst-case scenario to three or four years in the best case.

Nor have the strategic...