FollowingDonald Trump hinting at sidestepping a debate with Kamala Harris, Mary Trump, the niece of the former president and a psychologist, weighed in with her thoughts. Can’t Compete: Donald Trump can’t compete with Harris and “deep down he knows it,” said Mary Trump in a Substack post published on Sunday. She wrote that her uncle’s “disastrous” appearance at the National Association of Black Journalists conference underlined “how quickly he became incapable of controlling himself, of modulating his responses, of pretending.” Mary Trump, a podcaster and author who has been a vocal critic of …