Mary Trump is ripping Donald Trump, Jr. in a new interview, just the latest example of her insulting another member of her famous family. Appearing on this week’s episode of the “UnPresidented” podcast, Trump, a psychologist who has written a highly-critical book about former President Donald Trump, referred to her cousin Donald Trump Jr. as “weak” and “the stupidest one” in her family. “Donnie is a deeply unintelligent person. I’ve been asked this, who’s the stupidest one, and it’s him,” Mary Trump said.