Cameron plays down Boris Johnson Prime Minister talk

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?"

Prime Minister David Cameron tours and officially opens a new JCB factory in Sao Paulo today. Credit: Stefan Rousseau/PA Wire/Press Association Images

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."