Mayor of London Sadiq Khan in conversation with Phil Ponce on Sept. 16. (Chicago Tonight)

London Mayor Sadiq Khan on being elected the first Muslim to lead a major Western capital, and what he makes of U.S. presidential politics.

"A city that is going to be a global city can't stand still, you've got to constantly evolve it," said Mayor of London Sadiq Khan. (Evan Garcia / Chicago Tonight)

Sadiq Khan, the recently elected Mayor of London, is in Chicago to stoke business relations between the two cities.