WASHINGTON (AP) – Seeking to reassure anxious Israelis and their American supporters, Vice President Biden vowed Monday that the United States would not back down from its pledge to use military action to thwart Iran’s nuclear program should all other options fail.

“President Barack Obama is not bluffing,” he said.

In a prelude to Obama’s forthcoming trip to Israel – his first as president – Biden told a powerful pro-Israel lobby that the United States doesn’t want a war with Iran, but that the window for diplomacy is closing. He said that prevention, not containment, is the only outcome the United States would accept.

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