Brad Lander, the outgoing comptroller of New York City, announced Wednesday his candidacy for Congress, challenging U.S. Rep. Dan Goldman in a Democratic primary for a liberal district in lower Manhattan and northwest Brooklyn.

In an engaging launch video, Lander, a progressive ally of Mayor-elect Zohran Mamdani, called for courageous leadership in the face of Donald Trump’s attacks on New Yorkers. He emphasized the need for collective action against the challenges posed by an affordability crisis and the stigmatization of immigrant communities.

“At a moment of dark oppression, we can shine by fighting back together,” Lander asserted, highlighting his commitment to social justice. In a touching nod to the late children’s TV host Fred Rogers, he sang a line from Rogers’ iconic theme, reflecting his belief in community and collaborative democracy.

Since losing the Democratic mayoral primary to Mamdani this summer, Lander had been eyeing a challenge to Goldman. Mamdani, in his endorsement, praised Lander for his unwavering principles and dedication, suggesting that the former comptroller will continue to advocate for those who need government support the most.

Both candidates have positioned themselves as critics of the federal government's deportation agenda, with Lander making headlines for his involvement in immigration court protests, leading to his arrests during demonstrations.

Vermont Senator Bernie Sanders has also backed Lander, calling him a relentless advocate for working people. As a two-term congressman, Goldman is regarded as a moderate Democrat, known for his prosecutorial background and involvement in high-profile impeachment cases.

Lander concluded his campaign launch with a public speech in Brooklyn, embarking on a journey to rally community support as he aims to unseat Goldman in what is shaping up to be a competitive primary battle.