Donald Trump’s presidential campaign is barely two weeks old, and already it has his trademarks of bad company and bad judgment. Both were on display Tuesday evening when he hosted the rapper Kanye West (who now goes by Ye) and some comrades for dinner at Mar-a-Lago. One of the hangers-on was 24-year-old Nick Fuentes , a white nationalist who mocks the Holocaust. Mr. Trump claims that Mr. West had asked to see him and brought along Mr. Fuentes. The former President says he didn’t know who Mr. Fuentes is, but both Mr. West and Mr. Fuentes have said since the...