As a leader, Trump may or may not be smart, but his temperament ranks low on the scales of emotional and contextual intelligence that made Franklin D. Roosevelt or George H.W. Bush successful presidents. Tony Schwartz, who co-wrote Trump’s book The Art of the Deal, notes that “Trump’s sense of self-worth is forever at risk. When he feels aggrieved, he reacts impulsively and defensively, constructing a self-justifying story that doesn’t depend on facts and always directs the blame to others.” Schwartz attributes this to Trump’s defense against domination by a father who was “relentlessly demanding, difficult, and driven…You either dominated or you submitted. You either created and exploited fear, or you succumbed to it – as he thought his elder brother had.” As a result, he “simply didn’t traffic in emotions or interest in others,” and “facts are whatever Trump deems them to be on any given day.”Whether Schwartz is correct or not about the causes, Trump’s ego and emotional needs often seem to color his relations with other leaders and his interpretation of world events. The image of toughness is more important than truth. Journalist Bob Woodward reports that Trump told a friend who acknowledged bad behavior toward women that “real power is fear…You’ve got to deny, deny, deny and push back on these women. If you admit to anything and any culpability, then you’re dead.”Trump’s temperament limits his contextual intelligence. He lacked experience, and has done little to fill the gaps in his knowledge. He is described by close observers as reading little, insisting that briefing memos be very short, and relying heavily on television news. He is reported to have paid scant attention to staff preparations before summits with experienced autocrats like Russian President Vladimir Putin or North Korea’s Kim Jong-un. If Trump’s iconoclastic style was merely a breach of traditional presidential etiquette, one might argue that his critics were being too fastidious, or were trapped in old-fashioned views of diplomacy.But crudeness can have consequences. While pressing for change, he has disrupted institutions and alliances, only grudgingly admitting their importance. Trump’s rhetoric has downplayed democracy and human rights, as his weak reaction to the murder of Saudi dissident journalist Jamal Khashoggi demonstrated. Although Trump has echoed President Ronald Reagan’s rhetoric about the US being a city on the hill whose beacon shines to others, his domestic behavior toward the press, the judiciary, and minorities has weakened the clarity of America’s democratic appeal. International polls show a decline in America’s soft power since he took office.While critics and defenders debate the attractiveness of the values embodied by Trump’s “America First” approach, an impartial analyst cannot excuse the ways in which his personal emotional needs have skewed the implementation of his goals – for example in his summit meetings with Putin and Kim. As for prudence, Trump’s non-interventionism protected him from some sins of commission, but one can question whether his mental maps and contextual intelligence are adequate to understand the risks posed to the US by the diffusion of power in this century. As tensions grow, reckoning with Trump may well become unavoidable in 2019.