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Starmer defies Trump on Iran, risking the 'special relationship' over national security

The UK Prime Minister is doubling down on his refusal to support US-led efforts against Iran, prompting President Trump to warn that trade deals are not set in stone.

Foreign PolicyPublished April 15, 2026 at 3:27 PMProcessed April 16, 2026 at 7:15 AM
UK Prime Minister Keir Starmer and US President Donald Trump shake hands at a joint press conference in the East Room at the White House in February 2025

Prime Minister Sir Keir Starmer has publicly declared he will not yield to pressure from President Trump to commit British forces to the ongoing conflict with Iran.

Despite the President’s persistent criticism and warnings that the current UK-US trade deal could be subject to change, Starmer insisted in the Commons that joining the war is not in Britain's national interest.

The Prime Minister’s refusal to align with American military objectives has created a significant strain on the 'special relationship,' with President Trump openly questioning the utility of the alliance.

Trump, who has previously labeled Starmer 'no Winston Churchill,' noted that the trade agreement—which includes tariff cuts on cars, aluminum, and steel—was a concession that could be revisited.

While Starmer’s administration maintains that the partnership remains robust across multiple sectors, the economic fallout is already being felt, with the IMF cutting its UK growth forecast to 0.8% due to energy price volatility linked to the conflict.

President Trump has also taken aim at the broader UK policy agenda, labeling the government's current immigration and energy strategies as 'insane,' though he maintained that these diplomatic tensions would not impact the upcoming royal visit of King Charles and Queen Camilla.

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