David Cameron has today fended off rumours that London Mayor Boris Johnson has his eye on the Conservative leadership and the country's Prime Minister role.
In an interview for Brazilian newspaper Folha de Sao Paulo, the British Prime Minister was asked: "With the economy in crisis, we see mayor Boris Johnson, also of your party, with greater popularity than you.
"To the point there are rumours that he might be the Conservative candidate for the next general election. Do you feel your post is threatened?"
Mr Cameron responded by saying: "Not at all. Boris has been a great friend of mine for a long time and a first-class mayor of London.
"We're very lucky to have many big hitters in our party, but Boris still has much work to do as mayor, and so do I as Prime Minister."
Ouch! David Cameron may regret ever appearing on the Late Show with David Letterman.
David Cameron was subjected to a quiz on British culture and history as he appeared on one of the US's most influential chat shows.
The Prime Minister has agreed to an interview with David Letterman - a host notorious for setting his own agenda. This could be interesting.