Defense Secretary Leon Panetta has a lot on his mind these days, from cutting the defense budget to managing the drawdown of U.S. forces in Afghanistan. But his biggest worry is the growing possibility that Israel will attack Iran over the next few months.

Panetta believes there is a strong likelihood that Israel will strike Iran in April, May or June — before Iran enters what Israelis described as a “zone of immunity” to commence building a nuclear bomb. Very soon, the Israelis fear, the Iranians will have stored enough enriched uranium in deep underground facilities to make a weapon — and only the United States could then stop them militarily.

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