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Why are international mayors meeting in London?

A collection of mayors is called a "magnificence" and 30 of them have been meeting in a London hotel.

Daily Politics reporter Adam Fleming caught up with some of them at the summit, including New York's former mayor Michael Bloomberg who is being urged to run for US president.

They went on a tour of London's Crossrail site at Canary Wharf, which brought home the relative powers of UK and US mayors.

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