Prime Minister David Cameron has described Boris Johnson as a "first class" mayor of London who is "doing a great job".
"We are lucky to have some big and popular figures that can take the Conservative message out across the country," he told the Today programme's James Naughtie.
"I've always said to Boris: 'You do a brilliant job as mayor, when you finish your job as mayor don't give up on public service, think of other things that you can do, because you've got enormous talent and we should make sure that's for the country'."
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