US Republican presidential candidate Mitt Romney said Monday that as president of the United States he would prevent Iran from achieving nuclear weapons capability.

"I will put the leaders of Iran on notice," he said. "We will prevent them from achieving a nuclear weapons capability."

Romney added that the US would work with its allies to increase sanctions against Iran and would also increase its military presence in the region. The US "will work with Israel to increase military assistance and coordination," he said.

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