As a presidential candidate, Donald Trump broke not only from the Republican Party but also from the bipartisan consensus on U.S. foreign policy. Calling the Iraq War a terrible mistake and lamenting America’s nation-building expeditions, Trump evinced little interest in maintaining the traditional form of American leadership of the liberal international order. Instead, Trump’s “America First” vision called for a reassertion of American nationalism on the economic front as well as in foreign affairs.
As the United States adjusts to a changing global balance of power, nuclear deterrence is poised to return to a level of importance in U.S. national security not seen since the end of the Cold War. However, U.S. nuclear strategy will have to contend with emerging issues like arms control in a multipolar world, the evolution of strategic technology, and the new contours of great power competition.