Chicago heads to polls in heated mayoral election

Election pits Brandon Johnson, who previously supported defund the police, against Paul Vallas, endorsed by the police union

Pollsters and meteorologists are predicting a tempestuous election day in Chicago, the third largest city in the US.

The election pits two Democrats from the furthest ends of their party's spectrum against each other on Tuesday. Public safety is the number one issue and Democrats across the country are watching to see if Brandon Johnson, a progressive who has previously supported the defund the police movement, will defeat Paul Vallas, who nabbed the endorsement of Chicago's police union and once described himself as a Republican.