Donald Trump memorably took out a full-page advertisement in multiple newspapers in 1987 charging that America was carrying too much weight for its allies. In his first term he repeated this charge, threatening to withdraw from Nato and berating US allies around the world in the process. Last week’s gathering of Nato’s heads of government in Turkey suggests his approach is running out of steam as the world adjusts and the president bumps up against the limits of American unilateral power in Iran.

Trump’s domestic political opponents should breathe a sigh of relief but not rush headlong into an uncritical embrace of US alliances. For all his counterproductive bluster, Trump recognized something real. If his opponents in the Democratic and Republican parties are not more clear-eyed about what alliances cost Americans – as Biden failed to be with Israel – they will fuel the fires that brought Trump to power in the first place.

The Ankara summit shows the limits of how far Trump will go. Weakened by his failed war on Iran, which now seems destined to drag on in fits and starts indefinitely, Trump found that his attempt to dominate the meeting rang hollow. His talking points berating allies for not........

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