Prime minister surprisingly forceful at PMQs over US president’s volte face on Chagos and refusal to drop tariffs threat on Greenland

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For a man who chooses his words so carefully, there is no doubt that Keir Starmer’s shift in tone towards Donald Trump at prime minister’s questions was intentional.

Since the turn of the year, as the US president has shown his imperialist ambition, the prime minister’s softly-softly approach to his unpredictable friend in the White House has come under increased strain.

His delicately calibrated position – doing diplomacy in private and building a close relationship in the hope of having greater influence – blew up spectacularly on Saturday, when Trump threatened to impose 25% tariffs on European allies opposed to the US taking over Greenland.