And then there was one. With the exception of Jim Mattis, the US defence secretary, Donald Trump has now cleared the decks of people who stand up to him. The ousting of Rex Tillerson, whose firing was announced on Twitter, eliminates the gap between Trump’s anti-globalist instincts and the stance of America’s chief diplomat. Mike Pompeo, Tillerson’s replacement, shares the president’s undiplomatic mind-set. Pompeo is a Trump enabler. Trump’s America First foreign policy is now closer to becoming a reality. The portents for the world are far-reaching. One of Tillerson’s greatest sins was to call Trump a "moron". His leaked outburst followed a meeting in which the president had said that the US should multiply its nuclear weapons arsenal tenfold. Tillerson’s derogatory response broke two cardinal rules of working for Trump. The first was to show disloyalty, which Trump cannot abide. Questioning his IQ is taboo. The second was to repeatedly clash with him on the big questions. In pract...

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