"I think he's a good selection," McCain told Couric of Biden. "Joe and I have been friends for many, many years, and we know each other very well, and so I think he's made a very wise selection."
Earlier today, Biden ripped McCain during his , suggesting McCain will "have to figure out which of the seven kitchen tables to sit at" when considering economic issues, a reference to the fact that McCain couldn't remember how many homes he owned during an interview earlier in the week.
"I know that Joe will campaign well for Senator Obama, and so I think he's going to be very formidable," McCain added. "Obviously, Joe and I have been on different philosophical sides, but we have been - I consider him a good friend and good man."
In his comments today, Biden called McCain "genuinely a friend of mine" - but added that "you can't change America when you boast" that you've "been totally in agreement and support of President Bush."
"Do you think," Couric asked, "it will be more difficult now, Senator McCain, to criticize Barack Obama's foreign policy credentials, when someone like Joe Biden is on the ticket, a very experienced and respected voice on Capitol Hill in these matters?"
McCain responded by pointing to the differences between himself and Biden on national security issues.
"Well, I've always respected Joe Biden, but I disagreed with him from the time he voted against the first Gulf War to his position where he said you had to break Iraq up into three different counties," McCain said. "I never agreed with that. But I appreciate very much his dedication to trying to solve this genocide that's going in Darfur and other things that Joe Biden has done. But we really have different approaches to many national security issues. I look forward to whoever my running mate will be having a respectful debate with him on that as well."
For more of Couric's interview with McCain, tune into Face The Nation Sunday morning.