LONDON − His political instincts are unashamedly liberal and progressive. He is the city's first Muslim mayor and first of South Asian heritage. And he has frequently clashed with U.S. President Donald Trump.

Democrat Zohran Mamdani won New York City's mayoral race on Nov. 4 after a campaign focused on cost of living issues such as universal childcare, eliminating fares on buses and government-subsidized grocery stores.

But the next incumbent of New York City Hall, who takes office Jan. 1, is following in the footsteps of another mayor of a major global city with an outsize reputation for a diverse economic, social and cultural life.

America's mayor? Why people outside of New York should care about Mamdani's victory

Sadiq Khan has been London's mayor since 2016. He has led Britain's largest city with a left-leaning policy agenda even as the rest of the country, polls show, has moved rightward on issues such as immigration.