Republican presidential nominee Mitt Romney accused US President Barack Obama of failing to slow Iran's nuclear program and throwing ally Israel "under the bus," in his nomination acceptance speech delivered at the Republican National Convention in Tampa, Florida on Thursday.

"Every American was relieved the day President Obama gave the order, and Seal Team Six took out Osama bin Laden. But on another front, every American is less secure today because he has failed to slow Iran’s nuclear threat," Romney charged.

"In his first TV interview as president, he said we should talk to Iran. We’re still talking, and Iran’s centrifuges are still spinning," he added.

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