Sen. Lindsey GrahamLindsey GrahamSenate panel questions Lynch on alleged FBI interference The Hill's Whip List: Senate ObamaCare repeal bill Judiciary Committee to continue Russia probe after Mueller meeting MORE (R-S.C.), a foreign policy hawk, praised the GOP candidates' for their national security views on CBS's Face the Nation Sunday morning.

"Six months ago I was really worried that our party was drifting," Graham said, in an apparent reference to some Republicans' calls for pulling out of Afghanistan. "Last night was a hawkish debate that talked about listening to commanders."

Graham said he agreed with former Massachusetts Gov. Mitt Romney, former House Speaker Newt Gingrich (Ga.) and other Republican presidential candidates who said during a foreign policy-themed debate Saturday night that if other options failed the U.S. should attack Iran to prevent it from getting nuclear weapons, calling a nuclear Iran "the road to Armageddon."

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"If they get a nuclear weapon the world is going to go into darkness," he said.

Both Graham and Mississippi Gov. Haley Barbour (R) said that the GOP field was still wide open, and neither wrote off Texas Gov. Rick Perry who has dropped in the polls.

"We’re going through trying on the slipper," Barbour said, comparing the GOP primary to past Democratic primaries that had a wide-open field before voters ralled around nominees who won the general election: Presidents Bill ClintonBill ClintonBill Clinton: 'The water is going to keep rising’ whether US stays in Paris or not Bill Clinton issues warning on opioid crisis: ‘It’s going to eat us all alive’ Poll: Former AG Lynch should be investigated MORE and Jimmy Carter.

Graham, who said earlier this week that Perry needed to turn around his debate performances quickly, said he did much better Saturday night.

"He did better last night. If you’ve got time and money anything can happen in politics," Graham said. "He’s got time and money and talent, so I think he can come back."