Iran could be pushed into building a nuclear weapon if Israel threatens its existence, an adviser to the country’s supreme leader has warned. “We have no decision to build a nuclear bomb but should Iran’s existence be threatened, there will be no choice but to change our military doctrine,” said Kamal Kharrazi, an adviser to Supreme Leader Ayatollah Ali Khamenei, on Thursday. The comments have raised questions about what Iran has long claimed is a peaceful nuclear program. Iran is enriching uranium to up to 60 percent purity, whereas weapons-grade uranium is enriched to about 90 percent. If the current nuclear material on hand were enriched further, it would suffice for two nuclear weapons. 

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