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Sadiq Khan, mayor of London, poses for a photograph following a Bloomberg Television interview at City Hall in London, U.K., on Tuesday, June 28, 2016. Khan, who campaigned for Britain to remain in the EU, issued a statement immediately after the result was announced on Friday to reassure almost 1 million EU citizens living in London that they are welcome in the city and recognizing the enormous contribution they make to its economy and civic and cultural life. Photographer: Simon Dawson/Bloomberg via Getty Images

Sadiq Khan, mayor of London, poses for a photograph following a Bloomberg Television interview at City Hall in London, U.K., on Tuesday, June 28, 2016. Khan, who campaigned for Britain to remain in the EU, issued a statement immediately after the result was announced on Friday to reassure almost 1 million EU citizens living in London that they are welcome in the city and recognizing the enormous contribution they make to its economy and civic and cultural life. Photographer: Simon Dawson/Bloomberg via Getty Images