David Cameron talking to David Letterman
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David Cameron 'quizzed' by David Letterman

27 September 2012 Last updated at 05:33 BST

David Cameron has become the first serving British prime minister to appear on the Late Show with David Letterman, a popular US chat show.

The prime minister was quizzed during the interview on his knowledge of British history and culture.

James Landale reports.

Footage courtesy of Worldwide Pants