President Donald Trump is threatening to sue comedian Trevor Noah over a joke at last night's Grammy Awards, saying in an overnight post to Truth Social that Noah's crack claiming he visited Jeffrey Epstein's island was "false and defamatory."Noah, who hosted the awards show, had poked at Trump's relationship with Epstein and the president's ambitions for the U.S. to take over Greenland."That is a Grammy that every artist wants almost as much as Trump wants Greenland," Noah said.