Republican presidential front-runner Donald TrumpDonald John TrumpO’Malley tells Dems not to fear Trump Right way and wrong way Five things to know about the elephant trophies controversy MORE says he will not rule out using nuclear weapons against the Islamic State in Iraq and Syria.

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“I don’t want to rule out anything,” he said Thursday on NBC’s “Today.”

Trump noted he doesn't want to use nuclear weapons, calling them "a horror."

“The power of weaponry today is the single greatest problem that our world has, and it’s not global warming like our president said, it’s the power of weapons — in particular, nuclear," he said.

“I will be the last to use it. I will not be a happy trigger like some people might be, but I will never, ever rule it out.”

Trump has similarly refused to rule out using nuclear weapons in Europe, saying they could be used as a negotiating tool. He has also suggested arming Japan and South Korea with nuclear weapons in order to counter North Korea.