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Director of National Intelligence, James R. Clapper:  “Iran continues to develop technical expertise in a number of areas, including uranium enrichment, nuclear reactors and ballistic missiles, from which it could draw if it decided to build missile-deliverable nuclear weapons.  These technical advancements strengthen our assessment that Tehran has the scientific,  technical and industrial capacity to produce nuclear weapons…we assess [however] Iran could not divert safeguarded material and produce a weapon-worth of WGU (weapons-grade uranium) before this activity is discovered.”