The UK government has abandoned plans to pass legislation transferring sovereignty of the Chagos Islands to Mauritius after the United States withdrew its backing for the deal. Officials confirmed they had run out of time to advance the bill before the current parliamentary session closes, and a new Chagos bill is not expected to appear in the King's Speech in May. The collapse of the agreement, which would have leased Diego Garcia's joint US-UK military base for 99 years while ceding overall sovereignty to Mauritius, reflects deepening tensions between London and Washington, partly linked to disagreements over the use of British bases during the Iran conflict.