https://www.phillymag.com/news/2019/09/14/donald-trump-at-wharton-university-of-pennsylvania/

It’s rare for a professor to disparage the intelligence of a student, but according to attorney Frank DiPrima, who was close friends with professor William T. Kelley for 47 years, the prof made an exception for Donald Trump, at least in private. “He must have told me that 100 times over the course of 30 years,” says DiPrima, who has been practicing law since 1963 and has served as in-house counsel for entities including the Federal Trade Commission and Playboy Enterprises. “I remember the inflection of his voice when he said it: ‘Donald Trump was the dumbest goddamn student I ever had!’” He would say that [Trump] came to Wharton thinking he already knew everything, that he was arrogant and he wasn’t there to learn.”