Mary Trump, a clinical psychologist who is Donald Trump’s niece, told MSNBC that her uncle has “severe untreated psychiatric disorders.” In an interview on Sunday, Mary Trump reflected on her uncle’s recent debate with Vice President Kamala Harris. “She inflicted upon him a narcissistic injury so deep he will never recover from it, but I’m actually not being hyperbolic,” she explained. “Donald will revisit those moments for the rest of the campaign and probably for the rest of his life.” Want more breaking political news? Click for the latest headlines at Raw Story. MSNBC host Michael Steele n…