Former President Donald Trump is — often frivolously — accused of a long and varied list of things. One critique you don’t hear nearly as often from the peanut gallery, however, is that Trump is not a good performative speaker. (The man is in the WWE Hall of Fame, and professional wrestling is a modern-day vaudeville act, after all.) That’s no longer the case after acclaimed actor Sir Ian McKellen, perhaps best known to worldwide audiences for his portrayal of the wizard Gandalf in “The Lord of the Rings” movies, took a random potshot at the 45th President of the United States in an intervie…