NEW YORK — Outgoing City Comptroller Brad Lander is expected to this week launch a Democratic primary campaign against 10th District New York Congressman Dan Goldman, two sources familiar with the matter told the New York Daily News on Tuesday.

Lander, a progressive Democrat, is planning to challenge Goldman from the left, seeking to capitalize on Mayor-elect Zohran Mamdani’s popularity in the city.

Lander is, in fact, expected to get a coveted endorsement from Mamdani in conjunction with his congressional campaign kickoff, which could come as early as Wednesday, according to Politico, which first reported his expected announcement.

Spokespeople for Lander and Mamdani didn’t return requests for comment on Tuesday. Maddy Rosen, a rep for Goldman’s campaign, said the congressman is “focused on stopping the Trump administration from what they’re doing to immigrant families in his district right now.”

“He’s proud of his progressive record in Congress and will deal with Brad and other challengers in the new year,” Rosen added.

Goldman, a more moderate Democrat than Lander, has drawn the ire of the some of the more progressive voices in the party over his support of Israel, an issue that has taken on additional momentum amid the war in Gaza.

Goldman’s 10th Congressional District, which spans downtown Manhattan and sections of brownstone Brooklyn, went by double digits for the democratic socialist mayor-elect in November’s election, a fact progressives have seen as a sign Goldman could be vulnerable to a challenge in next summer’s congressional primary elections.

Lander used to represent parts of the 10th District as a City Council member, a job he held before becoming comptroller in 2022.

Lander ran for mayor in June’s Democratic primary, a contest he placed third in. Toward the end of that campaign, Lander cross-endorsed Mamdani under the city’s ranked-choice voting system, a move that was helpful in boosting the mayor-elect’s defeat of his main opponent, ex-Gov. Andrew Cuomo.

Initially, there were indications Lander was going to join Mamdani’s administration. But Mamdani ultimately decided not to hire Lander and instead informed him he’d be more inclined to support him if he ran for Congress, according to sources familiar with the matter.

It’s unclear how Mamdani’s expected involvement in the 10th District could impact Brooklyn Councilwoman Alexa Aviles, a fellow Democratic Socialists of America member who has also been exploring a challenge against Goldman. She didn’t immediately return a request for comment.

Mamdani’s reported plan to endorse Lander stands in contrast to the mayor-elect’s decision to not support City Councilman Chi Osse in his bid to challenge Brooklyn Rep. Hakeem Jeffries, a fellow centrist Democrat, in his Brooklyn-based 8th Congressional District.

At Mamdani’s urging, the Democratic Socialists of America’s New York City chapter voted last month to not endorse Osse’s 2026 bid against Jeffries, a move that ultimately prompted Osse to abandon his congressional run altogether.

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