New York City councilman Chi Ossé (D), a democratic socialist from Brooklyn and ally of Mayor-elect Zohran Mamdani (D.), launched a primary challenge against House minority leader Hakeem Jeffries (D., N.Y.) on Monday, setting up a fight between the highest-ranking Democrat in the House and a left-wing extremist. Ossé, who left the Democratic Socialists of America (DSA) after taking office in 2022 before rejoining the organization over the summer, hopes to follow Mamdani’s lead. Both DSA members,