Labour's controversial deal to hand the Chagos Islands to Mauritius risks collapse if Donald Trump refuses to amend a 60-year-old treaty.
Legislation for the deal, intended for debate in the House of Lords, has been delayed amid warnings it could breach a 1966 treaty with the US concerning UK sovereignty.
Donald Trump, who previously supported the agreement, recently reversed his position, labelling the deal “an act of great stupidity” on his Truth Social platform.
Ministers have conceded that the Chagos agreement cannot be ratified without US cooperation to overhaul the existing 1966 treaty.
The UK government accuses peers of “irresponsible and reckless behaviour” for delaying the legislation, which aims to secure the future of the crucial UK-US Diego Garcia military base.