Julian E. Zelizer is a professor of history and public affairs at Princeton University. He is also a political analyst for CNN, a contributor to National Public Radio’s Here & Now, and the co-editor with Karen J. Greenberg  of the forthcoming new book Our Nation at Risk: Election Integrity as a National Security Issue. Karen J. Greenberg is the director of the Center on National Security at Fordham Law. She is also the editor-in-chief of the daily CNS Soufan Group Morning Brief and the weekly CNS Aon Cyber Brief.