London mayor Boris Johnson on Sunday said he would support a vote for Britain to leave the European Union in a blow for Prime Minister David Cameron ahead of a membership referendum in June.<br />"I will be advocating vote Leave," said Johnson, a popular politician from Cameron's own Conservative Party who is seen as a potential successor to the prime minister.<br />Prime Minister David Cameron made a last-ditch appeal to London Mayor Boris Johnson to support Britain staying in the EU Sunday as he battles to make his case to eurosceptics ahead of a June 23 referendum.<br />Cameron used a BBC interview to address the charismatic Johnson, who is expected to announce his position at 22:00 GMT Sunday in a move which could transform the out campaign if he backs them.<br />Cameron also made clear his battle lines for the referendum, arguing that Britain is "safer" and "stronger" in Europe despite eurosceptic claims that the EU is bloated and unnecessary.<br />"I would say to Boris what I say to everybody else which is we'll be safer, we'll be stronger, we'll be better off inside the EU," Cameron said.
