US Republican presidential nominee Mitt Romney slammed US President Barack Obama's handling of the Iranian threat on Sunday, saying "Iran has not changed its nuclear course one iota by virtue of this president's policies."

"I don't think we live with a nuclear Iran. I think we make it very clear that a nuclear Iran is unacceptable to the United States of America, to civilized nations throughout the world, and that we will maintain every option that's available to us to keep that from happening," Romney said in an interview on NBC's Meet the Press.

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