New York City Mayor Zohran Mamdani backs— and is publicly considering backing— a Democratic primary challenger to U.S. Rep. Adriano Espaillat of New York. Multiple outlets report that Mamdani has endorsed Darializa Avila Chevalier, described as a democratic socialist and a Democratic Socialists of America (DSA)-aligned candidate, ahead of the Upper Manhattan congressional primary. The endorsement is reported to have been announced during a joint interview on MS NOW’s “The Briefing with Jen Psaki.” Other coverage frames the race as Mamdani supporting a bid to unseat Espaillat, who has served multiple terms in Congress. The New York Times adds that Mamdani had previously pledged support for Espaillat but is now weighing a shift toward the challenger. CBS News similarly reports that Mamdani endorses Espaillat’s challenger, naming the candidate and identifying the contest as a primary for Espaillat’s seat. Across the reports, the central point is Mamdani’s endorsement of Chevalier as the candidate seeking to challenge and potentially replace Espaillat in the Democratic primary.