As a presidential candidate, Donald Trump broke not only from the Republican Party but also from the bipartisan consensus on U.S. foreign policy. Trump’s “America First” vision called for a reassertion of American nationalism on the economic front as well as in foreign affairs. Since Trump took office, it has become clear that “America First” was more of a campaign slogan than a coherent vision of American grand strategy. Fuel to the Fire, a new book from Cato scholars Christopher A. Preble, John Glaser, and A. Trevor Thrall, characterizes and explains Trump’s foreign policy doctrine and the effect that he likely will have on U.S. foreign policy during his tenure.