Yu Ouyang is Associate Professor of Political Science at Purdue University Northwest, USA. He received his undergraduate degree from Valdosta State University and his PhD from the University of Kentucky. His research on U.S. executive politics and quantitative methods has appeared in Congress & the Presidency, Presidential Studies Quarterly, Public Administration Review, and Social Science Quarterly. His recent book examines Donald Trump's use of Twitter: Trump, Twitter, and the American Democracy: Political Communication in the Digital Age. Michael A. Morgan is Associate Professor of Political Science at Marietta College, USA. He received his undergraduate degree from Marietta College and his MA and PhD from the University of Kentucky. His research focuses primarily on American foreign policy and international security. He has had work published in Presidential Studies Quarterly and Contemporary Cases in U.S. Foreign Policy.