“She had no more surprises for him; the unexpected in her behaviour was the only thing to expect,” Henry James wrote in his novel Daisy Miller. Leaders dealing with Donald Trump surely recognise the sentiment. James’s character was a young American out of her depth in Europe, falling victim to prejudices. Mr Trump is a real-world problem, and this time, Europe is battered by the prejudices and vengefulness of the American.

This week alone the US president has publicly mocked the British prime minister and armed forces (as weak), the French president (over his marriage), told allies to get their own oil – having set the Middle East on fire – and said leaving Nato was “beyond reconsideration”. Mr Trump’s wishful thinking has hit reality in Iran, where the war that he and Benjamin Netanyahu began will not be easily ended. His resulting frustration, concern about domestic political repercussions and desire to distract the public are........

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