President Barack Obama says the United States will stand with Israel if it's attacked.

Obama said during Monday's presidential debate that Iran will not get a nuclear weapon "as long as I'm president."

Republican challenger Mitt Romney says he'd push for diplomatic isolation of the country. He says Iranian President Mahmoud Ahmadinejad's rhetoric fans genocide and should be prosecuted under international law.

Obama says tough U.S. sanctions have "crippled" Iran's economy to the point that it's a shambles. The president says Iran is ultimately a threat to American national security and is a state sponsor of terrorism.