SNELLVILLE, Ga. – Republican presidential candidate Mitt Romney warned voters here Sunday that if President Obama were elected to a second term, “Iran will have a nuclear weapon and the world will change.”

 Romney’s comments came just over an hour after Obama delivered a speech in Washington in which he urged Israel and its American supporters to allow more time for economic sanctions to help thwart the Islamic Republic’s nuclear development.

 “This is a president who has failed to put into place crippling sanctions against Iran,” Romney said. “He’s also failed to communicate that military options are on the table and in fact in our hand. And that it’s unacceptable to America for Iran to have a nuclear weapon.

 “I will have those military options, I will take those crippling sanctions and put them into place, and I will speak out to the Iranian people of the peril of them becoming nuclear,” Romney said. “It’s pretty straight-forward in my view. If Barack Obama is reelected, Iran will have a nuclear weapon and the world will change if that’s the case.”

 Romney’s remarks came in response to a question from an 11-year-old boy at a campaign stop in Snellville, a suburb of Atlanta. Romney served pancakes with his wife, Ann, to an overflow crowd of more than 1,000 at a high school here before delivering a stump speech and taking questions from the audience.

 On Tuesday, Romney plans a satellite address to the annual policy conferenceof the American Israel Public Affairs Committee, or AIPAC, the same powerful lobbying group Obama addressed on Sunday.