Israel's President Shimon Peres, left, and US Republican presidential candidate Mitt Romney walk during a meeting at the President's residence in Jerusalem, Sunday, July 29, 2012. Romney would back an Israeli military strike against Iran aimed at preventing Tehran from obtaining nuclear capability, a top foreign policy adviser said early Sunday, outlining the aggressive posture the Republican presidential candidate will take toward Iran in a speech in Israel later in the day. (AP Photo/Sebastian Scheiner)
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