CIA head: U.S. intel has 'robust' knowledge of Iran nuclear capabilities

CNN: Iran would build a nuclear bomb "at their own peril" if nuclear talks with the United States and other leading countries falter, Central Intelligence Agency Director John Brennan said Sunday.

"I think they realize that there's going to be tremendous costs and consequences and implications if they were to decide to go for a 'breakout,'" Brennan said on "Fox News Sunday," referring to Iran amassing enough of the materials necessary to build a nuclear bomb rather than use those materials for civil energy.

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