President Joe Biden referred to former President Trump as an “existential threat” during a fundraiser in New York City on Wednesday, as anti-Israel protesters blocked Fifth Avenue outside the Metropolitan Museum of Art. “There is one existential threat: it’s Donald Trump,” Biden told business leaders during his first stop of the day at the Upper West Side home of Larry Linden, the former managing partner of Goldman Sachs. “He’ll try to undo everything we’ve done… We can’t let that happen,” Biden said. “There is only one existential threat we face in the world: and that’s the environment.” The president had...