WASHINGTON (AP) - Sen. Lindsay Graham is siding with a Republican presidential candidate who's calling for military action if all else fails to stop Iran from developing a nuclear weapon.

The South Carolina Republican says he supports "totally, absolutely, without any doubt" former Massachusetts Gov. Mitt Romney's call during a Saturday debate for the military last-resort option to keep nuclear weapons out of Iran.

Graham says in a television interview, quote, "If they develop nuclear weapons, the whole region is going to want a nuclear weapon. If you open Pandora's box, if you attack Iran if they get a nuclear weapon, you empty Pandora's box."

Graham also said it's important to "neuter this regime" by destroying its military and persuading Iranians to demand a regime change.

Graham appeared on CBS' "Face the Nation."

(Copyright 2011 by The Associated Press. All Rights Reserved.)