A University of South Carolina alumnus and donor said he would still keep his upcoming meeting about funding an endowment for the school’s Honors College. But the donor was furious and appalled at the school for introducing former President Donald Trump on the field at halftime of last November’s football game against Clemson. Dressed in a blue suit and striped tie, Trump smiled, clapped and waved to the crowd, which showered him with a mixture of cheers and jeers. “Give me a reason to believe in USC again,” the email to Athletics Director Ray Tanner said. “Give me a reason...