President Donald J. Trump's foreign policy rhetoric and actions become more understandable by reference to his personality traits, his worldview, and his view of the world. His campaign rhetoric catered to Americans comfortable with isolationism and certainly with no appetite for foreign military engagements. So, his foreign policy emphasis was on American isolationism and economic nationalism. He is not really interested in delving too deeply into some of the substantive issues of international politics, particularly the prevailing quandaries in the East Asia, Middle East and North Africa, and Central and Eastern Europe. Why bother when simple solutions will suffice, for his purposes. He has placed America's global superpower status at risk. The gradual decline of its global influence seems inevitable. Companion volume: John Dixon, Donald J. Trump as U.S. President: "It's all about me!" (Westphalia Press, Washington, DC, 2018). John Dixon is Professor of Public Administration at the Middle East Technical University in Ankara, Turkey. He is a fellow of the British Academy of the Social Sciences in 2004, and has been an honorary life member of the American Phi Beta Delta Honor Society for International Scholars since 2006. Max J. Skidmore is University of Missouri's Curators' Distinguished Professor of Political Science and Thomas Jefferson Fellow at the University of Missouri-Kansas City. He has been Distinguished Fulbright Lecturer to India, and Senior Fulbright Scholar at the University of Hong Kong.