‘There is no option of surrender’: can Zohran Mamdani cause the greatest progressive upset in New York politics?

Six months ago, the 33-year-old was an unknown outsider polling in single digits. Now he is in striking distance of becoming New York's youngest, most leftwing mayor in a century

Zohran Kwame Mamdani is huddling with advisers surrounded by agitated protesters, New York police department (NYPD) officers and lines of metal barriers penning us in. An hour ago Brad Lander, the elected comptroller of New York who is running against Mamdani in the race to become the city's next mayor, was arrested by masked agents of US Immigration and Customs Enforcement (Ice) as he accompanied an individual out of immigration court. Video shows the agents shoving Lander against a wall, handcuffing him, and scuffling him away.

The incident has clearly rattled Mamdani. He looks tense, and when greeted by supporters his trademark beaming smile is replaced by a tight grin.