Sir Keir Starmer has delayed legislation underpinning the proposed transfer of the Chagos Islands to Mauritius following strong opposition from the United States. The bill, which had been due to return to the House of Lords, was withdrawn after Conservative peers warned it could conflict with a 1966 UK–US treaty guaranteeing British sovereignty over the territory. The agreement would see the UK cede the archipelago while leasing back the Diego Garcia military base, a strategically important facility used by both British and American forces.
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The issue escalated after Donald Trump publicly criticised the proposal, describing it as “an act of great stupidity”. US officials have since reiterated those concerns, raising questions about whether the deal would undermine existing defence arrangements. Although ministers had previously said talks were under way to update the 1966 treaty, discussions have not concluded, leaving uncertainty over the legal status of the agreement and its compatibility with international obligations.
Political tensions have intensified in Westminster, with the Conservatives calling for ratification to be paused until treaty issues are resolved. Opposition figures argue that proceeding without Washington’s consent risks breaching international law and damaging relations with a key ally. The Government has rejected these claims, insisting the agreement is lawful and essential to secure the long-term future of the Diego Garcia base while avoiding prolonged legal disputes.
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Relations between Downing Street and the White House have deteriorated further following separate disagreements over foreign policy and defence. Despite the setback, ministers maintain that the Chagos deal remains vital for national security and aligned with a 2019 advisory ruling from the International Court of Justice. For now, however, the legislation has been shelved, with further scrutiny and diplomatic negotiations expected before it can progress.
