Sen. John McCain said he thinks his former vice presidential nominee would make a "very formidable" candidate if she were to join the race for the GOP nomination.
The Arizona senator said Sarah Palin has not reached out to him about the possibility of making a bid, and declined to say whether he thought she should.
"That's a decision that is so personal," McCain told CBS' "Face the Nation" Sunday. "[But] I think she would be very formidable."
McCain noted that it's still early in the campaign and "a lot of things are going to happen" that will likely change everything, recalling that this time in 2007, his own presidential campaign was considered doomed.
The former Republican nominee said one such potential game-changer could be former New York City Mayor Rudy Giuliani, whom he said he's heard could be getting into the race.
Using the same words he used to describe Palin, McCain said of Giuliani, "I think he would be very formidable."
Speculation over Palin's possible entry into the presidential race reached fever pitch Friday after her political action committee released this video:
Watch video of McCain's interview below. His comments about Palin begin at the 5:30 mark: