Legendary rocker Rod Stewart seemingly referred to President Donald Trump as a "little rat bag" during a candid conversation with King Charles III. A viral clip shared by Rebecca English, the Daily Mail's royal editor, captured an awkward moment as the king, 77, greeted a group of celebrities - including Stewart, 81, and his Faces bandmate Ronnie Wood - backstage at the the 50th anniversary celebration of The King's Trust charity at London's historic Royal Albert Hall on Monday, May 11. Stewart seemingly surprised Charles with a joke about the monarch's recent state visit to the U.S.