Washington, Nov. 23 -- After months of trading insults, US President Donald Trump and incoming New York mayor Zohran Mamdani smiled at each other, swapped compliments and pledged to collaborate on tackling crime and affordability in the nation's biggest city at an unexpectedly friendly meeting at the White House on Friday. The political opposites - a Republican billionaire and a young democratic socialist - have clashed over everything from immigration to economic policy. But it was clear the two forged a rapport in their first encounter. Mamdani, a 34-year-old state lawmaker, stood by Trump's desk as the 79-year-old president smiled up at him and patted him warmly on the arm, having only recently falsely caricatured Mamdani as an antisemit...