Julian E. Zelizer is a columnist at Foreign Policy and a professor of history and public affairs at Princeton University. He is the author of The Long View, a newsletter putting the news in perspective.
Republican presidential candidate and former U.S. President Donald Trump pumps his fist as he is rushed offstage during a rally in Butler, Pennsylvania, blood on his face.
Lyndon B. Johnson is surrounded by soldiers in this black-and-white photo as he visits U.S. troops in Vietnam. Johnson smiles as he shakes hands with a service member wearing uniform. He is flanked by security officers in dark suits.
