President Trump urged New York City Mayor Zohran Mamdani to “cherish” billionaires like Ken Griffin after the Citadel CEO threatened to bolt from a  Park Avenue skyscraper project  and move to Miami in response to the socialist mayor’s attacks. “When you lose people like that, it’s sort of not recoverable,” Trump told WABC radio host Sid Rosenberg. Hedge fund titan Ken Griffin said this week that he’s shifting jobs to Miami because of Mamdani. AFP via Getty Images “Always you say something’s recoverable, right? But it’s not recoverable. Then they build something else. They’re going to be there for 30 years. They don’t come back. And you’ve got to do the opposite. You’ve got to cherish them,” Trump said. “You got to bring them to the office. You got to meet them. You have to have dinner with them. You have to convince them not to leave, you’re going to make their life great, you’re going to help them with their building, with their project.…