Former New York Mayor Rudy Giuliani says if Sarah Palin had been president when the U.S. came under attack on Sept. 11, 2001, he's confident she would have been able to handle the crisis.

Palin's experience as the mayor of a tiny Alaska town and as Alaska's governor for less than two years have led critics to question her readiness to be vice president in a John McCain administration -- and president should he be unable to continue serving.

In an interview Wednesday on ABC's "Good Morning America," Giuliani was asked, "If she were the president on 9/11, you would have been confident?"

Giuliani responded: "I'd be confident that she'd be able to handle it. She's been a governor of a state, she's been mayor of a city."