JD Vance, Trump’s running mate and U.S. first millennial Vice President-elect, was once a harsh critic of the GOP supremo: What changed?

Ohio Senator JD Vance, at 40, has been chosen as Donald Trump's running mate for the upcoming presidential election. Once a Trump critic, Vance's transformation reflects Trump's influence on the GOP. His working-class roots and conservative stance are expected to appeal to key demographics.