The United Kingdom's plan to transfer sovereignty of the Chagos Islands to Mauritius has been abruptly shelved after a dramatic reversal of support from US President Donald Trump, throwing the future of the strategically vital Diego Garcia military base into uncertainty and igniting a fierce political debate in Britain. The decision, confirmed on April 11, 2026, comes after months of diplomatic wrangling, legal hurdles, and mounting criticism from across the political spectrum.
The shelved agreement, which would have seen the UK cede sovereignty of the British Indian Ocean Territory to Mauritius and then lease back the Diego Garcia base for joint UK-US military use, was once hailed as a "monumental achievement" by the US administration. According to BBC, the deal involved the UK paying an average of £101 million ($136 million) annually to maintain its operations on the island—a figure that became a lightning rod for criticism as the political climate shifted.
At the heart of the controversy is Diego Garcia, the largest island in the remote Chagos archipelago, which has served as a linchpin for Western military operations in the Middle East, Afghanistan, and beyond. The base's strategic importance has long made the archipelago a geopolitical flashpoint, and the proposed sovereignty transfer was intended to resolve a decades-old dispute with Mauritius, which has asserted its claim to the islands since gaining independence.
Yet, as the agreement neared its final legislative stages in the UK, Donald Trump—who had initially supported the plan—abruptly withdrew his backing. In a series of statements, Trump branded the deal "an act of great stupidity" and later, in January 2026, called it "an act of total weakness." According to Metro, this reversal came amid broader tensions with NATO allies and during the ongoing Iran war, further complicating the diplomatic landscape.
The legal machinery underpinning the deal ground to a halt as well. A critical step—a formal exchange of notes or letters from Washington—remains unfulfilled, a technical but legally required move for the treaty to take effect. As a result, the Bill to cede sovereignty is not expected to appear in the upcoming King's Speech, which outlines the UK's legislative agenda for the next parliamentary session. Government officials have acknowledged that time has run out to pass the necessary legislation before Parliament is prorogued in mid-May.
A government spokesperson, quoted by BBC, underscored the centrality of US support: "Diego Garcia is a key strategic military asset for both the UK and the US. Ensuring its long-term operational security is and will continue to be our priority—it is the entire reason for the deal. We continue to believe the agreement is the best way to protect the long-term future of the base, but we have always said we would only proceed with the deal if it has US support. We are continuing to engage with the US and Mauritius."
Political reactions in Britain have been swift and deeply divided. Conservative leader Kemi Badenoch welcomed the move, declaring the agreement should find its "rightful place—on the ash heap of history." She criticized Prime Minister Keir Starmer for allegedly "fighting to hand over British sovereign territory and pay £35 billion to use a crucial military base which was already ours." Badenoch added, "That it took so long is another damning indictment of a Prime Minister who fought to hand over British sovereign territory and pay £35 billion to use a crucial military base which was already ours."
On the other side, the Liberal Democrats described the handling of the deal as "totally shambolic." Their foreign affairs spokesman, Calum Miller, pointed to Trump's changing stance as evidence of the fragility of the UK-US partnership: "But Trump's fickle approach shows just how unreliable he is. We had a strong, stable and effective military partnership with the US. Trump has gravely endangered that. Any deal must provide clarity on the future military partnership with the US and address Chagossian rights and Parliamentary scrutiny of the sums involved."
Reform UK leader Nigel Farage, meanwhile, called the pause "long overdue" and urged the government to focus on resettlement rights for displaced Chagossians. Many Chagossians, forcibly removed from their homeland decades ago, have voiced strong opposition to the deal, seeing it as a betrayal that fails to guarantee their right to return. According to BBC, Farage said: "Now the government must right a terrible wrong and help the Chagossians to fully resettle their home."
Former Foreign Office permanent secretary Lord Simon McDonald told BBC Radio 4 that the government had "no other choice" but to shelve the deal: "The UK had two objectives, one was to comply with international law, the second was to reinforce the relationship with the United States. When the president of the United States is openly hostile, the government has to rethink, so this agreement, this treaty will go into the deep freeze for the time being."
The roots of the dispute stretch back to the early 19th century, when Britain first took control of the Chagos Islands. The archipelago's status has been hotly contested since Mauritius gained independence, culminating in a 2019 advisory ruling by the International Court of Justice that supported Mauritian claims to sovereignty. The UK government has cited this ruling as a key reason for pursuing the agreement, arguing that it would secure the future of the Diego Garcia base while resolving a long-standing international dispute.
Despite these intentions, the lack of a formal exchange of letters from the US has left the deal in limbo. The US Department of State had officially backed the UK plan a day before Trump's latest reversal, highlighting the unpredictable nature of the current diplomatic environment. According to Metro, confusion also reigned in February 2026, when Foreign Office minister Hamish Falconer mistakenly told the Commons that the deal had been "paused," only for officials to later clarify that he had misspoken.
With no Chagos-related legislation expected in the King's Speech and ongoing negotiations with both the US and Mauritius, the future of the agreement remains highly uncertain. The shelving of the deal has exposed deep divisions within British politics and raised questions about the reliability of international partnerships in an era of shifting alliances and rising geopolitical tensions.
For now, Diego Garcia remains a focal point of strategic competition and unresolved historical grievances, as the UK government continues to weigh its options amid pressure from allies, critics, and the displaced Chagossian community.