Given the nature of the Shi'a Twelver regime in Iran, that's one nuclear weapon too many for a regime which has declared its intent to wipe another sovereign state off of the face of the earth.
Graham Allison had a good article in the YaleGlobal back in June 2006.
He wrote:
But on the specifics about Iranian centrifuges Allison wrote:The dog that hasn’t barked is Iran’s covert programs for acquiring nuclear weapons. Four huge “known unknowns” lie at the heart of judgments about the threat posed by Iran.
...the father of the Pakistani nuclear program, Dr. A.Q. Khan, sold Iran advanced P2 centrifuge designs that are still unaccounted for.
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