Donald Trump, who used to say Michael Jackson was the world’s greatest entertainer, might have a new favorite. After catching the opening night of Lady Gaga‘s sold-out Radio City concerts with wife Melania, Barbara Walters, Gayle King and CNN’s Alina Cho, Trump was invited backstage for a private meeting with Gaga — and she even autographed a Polaroid of them with his “Apprentice” catchphrase, “You’re fired!” A rep for Trump said, “He thinks she is amazing, and it was one of the best concerts he has seen.”