Republican Presidential nominee John McCain finally made an appearance in David Letterman's show after the much-publicized cancellation he made last month.

McCain took responsibility on his mistake which earned a month's worth of criticisms from the late night talk show host. The Arizona senator was reportedly seen doing a live interview on another channel at the same time he canceled his appearance on Letterman's show.

"I screwed up. What can I say?" the politician told Letterman on Thursday.