Hillary Clinton addresses the U.S. Conference of Mayors on June 26. Clinton discussed her vision for American cities, but issues like that have been overshadowed by her email scandal. Aaron P. Bernstein/Getty Images hide caption

toggle caption Aaron P. Bernstein/Getty Images

Making America Great Again - a nationalist slogan - has been the central theme of Donald Trump's presidential campaign AP hide caption

toggle caption AP

From 'Brexit' To Trump, Nationalist Movements Gain Momentum Around World

  • Download
  • <iframe src="https://www.npr.org/player/embed/483400958/483499879" width="100%" height="290" frameborder="0" scrolling="no" title="NPR embedded audio player">
  • Transcript

Republican presidential candidate Donald Trump gestures during a rally at the San Jose Convention Center earlier this month. Josh Edelson/AFP/Getty Images hide caption

toggle caption Josh Edelson/AFP/Getty Images

Donald Trump holds a media conference announcing the establishment of Trump University on May 23, 2005, in New York City. Thos Robinson/Getty Images hide caption

toggle caption Thos Robinson/Getty Images