New York City Mayor Zohran Mamdani vows to govern 'audaciously' | Live updates

The new mayor gave his speech just moments after his public swearing-in ceremony.

Political expert David Birdsell analyzes the message of Mamdani's speech.

Kean University provost David Birdsell joins Eyewitness News to discuss the new mayor.

Sonia Rincon reports on the Mayor's inauguration.

"Beginning today, we will govern expansively and audaciously. We may not always succeed, but never will we be accused of lacking the courage to try," Mamdani told a cheering crowd.

"To those who insist that the era of big government is over, hear me when I say this: No longer will City Hall hesitate to use its power to improve New Yorkers' lives," he said.

This is part of his first public address to New Yorkers.

CeFaan Kim reports from City Hall.

The crowd rose to its feet as Senator Bernie Sanders took the stage to swear in Mamdani.

Sanders, praising Mamdani's campaign, told the crowd that "When people stand up, there's nothing we cannot accomplish."

He also applauded Mamdani's ambition to use government power to help lift the millions of people struggling with the city's high cost of living.

Sanders insisted that doing so - partly by raising taxes on the rich - wouldn't be radical.

"In the richest country in the history of the world, making sure that people can live in affordable housing is not radical," he told the crowd. "It is the right and decent thing to do."

Bernie Sanders spoke to the crowd, before performing a ceremonial swearing in of the new mayor.

He then presided over a ceremonial swearing-in of Mamdani as mayor. He officially took the oath of office just after midnight.