Donald Trump has never claimed to be a foreign policy expert. He does not like in-depth reading, and prefers one-page policy option papers with “lots of graphics and maps.” He claims to have a “very good brain,” and promises to be a strong leader who puts “America first” and makes it “great again.” Should we believe him? His goals may well be laudable. But if my work on expertise and naïveté in foreign policy decision-making is any indication, President Trump, and his advisors, like other American and non-American leaders and their subordinates, will unconsciously follow a fundamentally biased judgment strategy. They will make the most important decisions of our time, those regarding choices of war and peace, by instinctively employing a “cognitive miser” or cognitive processing cost-minimizer strategy. Whenever system or state conditions are fluid enough for American decision-makers to disagree, to debate the merits of potential foreign policy actions, President Trump will prefer military instruments of policy to non-military instruments of policy, as long as his military experts propose and support such options. Otherwise, he will accept non-military initiatives, if they are offered and endorsed by his non-military specialists. Certainly, Trump appears to have a unique decision-making style, personality, and character; and perhaps each of his advisors does too. This is often the case with foreign policy actors.