US Republican presidential candidate Mitt Romney has said his country has a “moral imperative” to stop Iran from developing nuclear weapons.
Mr Romney, speaking during a visit to Jerusalem, said Iran was the most destabilising country in the world.
He said the US recognised Israel’s right to defend itself and that it was right for the US to stand with Israel.
US President Barack Obama has focused on using sanctions to contain Iran’s nuclear ambitions.
In his speech in front of Jerusalem’s Old City, Mr Romney said Iran’s leading ayatollahs were “testing our moral defences”.
“They want to know who will object and who will look the other way. We will not look away nor will our country ever look away from our passion and commitment to Israel.”