California Gov. Gavin Newsom tells Jon Karl that the Democratic Party should learn "how to build a brand" from NYC mayoral candidate Zohran Mamdani. "My hope is for all of us that when he wins...that he's as effective governing the city as he was campaigning." Watch tomorrow at 8:30PM ET on ABC News Live and stream on Disney and Hulu. | ABC News

Gov. Gavin Newsom tells ABC News’ Jon Karl that Democrats must recognize what he calls a “revolution” reshaping the country. Newsom says President Trump is “attacking every single institution of independent thinking” and warns his party is “playing by the old set of rules.” Watch the full conversation TONIGHT at 8:30pm ET on ABC News Live and stream on Disney and Hulu. | ABC News