Sen. Lindsey GrahamLindsey Olin GrahamSenators introduced revised version of election cyber bill GOP senators push tougher sentencing for synthetic opioid Dems aim to turn ObamaCare hikes into election weapon 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."

"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 ClintonWilliam (Bill) Jefferson ClintonKentucky candidate takes heat for tweeting he'd like to use congressman for target practice Will Sessions let other 'McCabes' off the hook or restore faith in justice? Progressive group launches anti-Trump 'We the Constitution' campaign 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."