In April, Trump thrust Canada and Mexico – as well as many of his advisers and cabinet officials – into a state of panic during a frenetic, if brief, period when he threatened to withdraw from the North American Free Trade Agreement. In May, speaking in front of NATO's sparkling new headquarters, Trump alarmed European allies when he chastised them for "not paying what they should be paying" and refused to embrace the treaty's cornerstone – that an attack on one represents an attack on all. And in September, as the crisis with North Korea escalated, Trump abruptly threatened to withdraw from a free-trade agreement with South Korea.