James will swear him in for the ceremony following New Year’s Eve, and Sanders will do so at his inauguration celebration. The transition was dubbed “Inauguration of a New Era” and will include a public block party.

“It is an honor to be sworn in by two leaders I have admired for years: Attorney General Tish James and Senator Bernie Sanders,” Mamdani said in a statement.

“Attorney General James has taken on powerful interests in her defense of New Yorkers and embodied the principle of equal justice before the law,” he added. “Senator Bernie Sanders laid the foundations for our movement with his steadfast commitment to the dignity of working people and his belief in a government that serves the many, not just the few. I can think of no better leaders to help usher in a new era for New York City.”

James said it will be an “honor” to swear in Mamdani as the city’s 112th mayor.

“He ran a campaign that brought together New Yorkers around the universal idea that we should all be able to afford to live in our city. I look forward to working with him and his Administration to deliver on that vision as we keep all New Yorkers safe,” she said in a statement.

Sanders said Mamdani represents a “new generation of progressive leadership.”

“At a moment when democracy is under attack and cynicism about our politics runs deep, Zohran Mamdani represents a new generation of progressive leadership rooted in courage, integrity, and solidarity,” he said in a statement.

“His victory is not just about one city or one election, it is about the strength of a working-class movement that says unequivocally: the future of New York belongs to the people, not the billionaire class. It is my honor to swear him in as the next mayor of New York City,” Sanders added.

Sanders backed and campaigned with Mamdani in his bid for the mayor’s office. James also endorsed and campaigned with Mamdani.

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The transition has billed the inauguration as a “citywide celebration” and has plenty of funds to spend on it. Mamdani’s transition has raised millions of dollars since he was elected mayor.

The transition is expected to have between 40,000 and 50,000 attendees, the New York Post reported.