P resident Donald Trump warned Democratic mayoral primary winner and state Assemblyman Zohran Mamdani that if he becomes New York City mayor, he "better behave" or he will have "big problems," after Israeli Prime Minister Benjamin Netanyahu was asked if he's worried about Mamdani arresting him.

Mr. Mamdani’s victory upended city politics and reverberated nationally. He relied on a memorable message, charisma and a strong ground game.

New York’s Democratic nominee for mayor, Zohran Mamdani. The president, who has a history of spewing sometimes vile insults at rivals, has in recent days escalated his attacks against the 33-year-old self-described democratic socialist.