London's colourful mayor Boris Johnson has been caught on camera swearing at a taxi driver, and telling him to 'die'.
The video which has been published by the Sun newspaper shows Mr Johnson responding to a black cabbie while on his bicycle.
It comes just after Boris Johnson has returned to parliament as a Conservative MP - and he is known to have Prime Ministerial ambitions.
Tom Newton-Dunn is the political editor of the Sun newspaper.
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Political reporter Theo Usherwood says it's unclear how damaging this will be for Mr Johnson.
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