In this photo provided by CBS, British Prime Minister David Cameron, left, talks with host David Letterman on the set of the “Late Show with David Letterman,” Wednesday, Sept. 26, 2012

 

              In this photo provided by CBS, British Prime Minister David Cameron, left, talks with host David Letterman on the set of the “Late Show with David Letterman,” Wednesday, Sept. 26, 2012
In this photo provided by CBS, British Prime Minister David Cameron, left, talks with host David Letterman on the set of the “Late Show with David Letterman,” Wednesday, Sept. 26, 2012 in New York. (AP Photo/CBS, John Paul Filo) MANDATORY CREDIT; NO ARCHIVE; NO SALES