Sadiq Khan on why he wants to be the next mayor of London

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Sadiq Khan tells presenter John Humphrys what's his priorities to tackle extremism. He said: "First priority is to keep our city safe... We are going to be closing down the websites that are radicalising Londoners in their bedrooms on the internet." "We need to promote British role models, we have to give support to British Muslims who are tackling these radicals and extremists." (Picture: Sadiq Khan Copyright: AFP/Getty Images)