 CBS News Special Report. Big day for Donald Trump, who's now won the Republican nomination for president at the party's convention in Milwaukee. Our Matt Piper says Trump also introduced his new running mate, Ohio Senator J.D. Vance, on Truth Social. After lengthy deliberation and thought and considering the tremendous talents of many others, I have decided that the person best suited to assume the position of Vice President of the United States is Senator J.D. Vance of the great state of Ohio. That from the former president writing on his Truth Social platform.