The difference is that ISIS is armed with butcher knives, captured weapons and YouTube, whereas Iran could soon be armed with intercontinental ballistic missiles and nuclear bombs. We must always remember. I'll say it one more time; the greatest dangers facing our world is the marriage of militant Islam with nuclear weapons. To defeat ISIS and let Iran get nuclear weapons would be to win the battle, but lose the war. We can't let that happen.

Address to the United States Congress (March 2015)