The arsonist who torched the Fox News Christmas tree Wednesday allegedly exposed himself to a group of reporters outside the Ghislaine Maxwell trial in Manhattan last week, a photographer told The Post. Craig Tamanaha, 49, was captured on camera moments after pulling down his pants to show his privates to members of the media on the first day of the high-profile trial of Jeffrey Epstein’s former girlfriend, said Jeenah Moon, a freelance journalist.