Jon Huntsman’s giving a big foreign policy speech in New Hampshire today, featuring another call to pull back from the war in Afghanistan and “right-size our current foreign entanglements.”

The speech also includes an uncharacteristically hawkish note from Huntsman, who says he would be willing to use U.S. military tools to stop Iran from acquiring nuclear weapons.

“I cannot live with a nuclear-armed Iran. If you want an example of when I would use American force, it would be that,” Huntsman will say in his remarks today.

Huntsman also previously told New Hampshire’s WMUR station: “What do you do when Iran all of a sudden develops a weapon of mass destruction over the near year to year and a half? …Now, if ever there was a reason to consider using U.S. force, it would be in pursuit of situations like that.”

Advance excerpts of Huntsman’s speech today suggest it will not be a hawkish affair, overall. He’ll call for “more agility, more intelligence, and more economic engagement” in U.S. foreign policy, rather than “simply advocating more ships, more troops, and more weapons.”

That’s a not-so-veiled contrast with the foreign policy speech Mitt Romney gave on Friday, and Huntsman develops his view on defense spending at greater length, as Morning Score previewed:

A reexamination of America’s role in the world also requires a reexamination of our military and defense infrastructure. It may surprise some people to learn that we spend more on defense today than at the height of the Cold War. Indeed, we spend more on defense than the rest of the world combined. We still have remnants of a top-heavy, post-Cold War infrastructure. It needs to be transformed to reflect the 21st Century world, and the growing asymmetric threats we face. For example, counterterrorism needs to be a much larger part of our foreign policy. We must be prepared to respond to threats – from Al Qaeda and other terrorist cells – that emanate from a much more diverse geography, including Yemen, the Horn of Africa, Pakistan and the Asia-Pacific.