Donald Trump’s heated clash at a Black journalists conference sent shockwaves through social media Wednesday afternoon as critics expressed disbelief that the Republican presidential nominee would question whether Vice President Kamala Harris is, in fact, a Black woman. “This Trump NABJ interview is an absolute DISASTER,” wrotecomedian Travon Free. “I can’t believe he’s saying this stuff into a microphone.” Trump spoke for just over 30 minutes before being cut off by his own team at the National Association for Black Journalists event Wednesday in Chicago, where he called interviewer Rachel Sc…