Donald Trump has accused the United Kingdom of “stupidity” over its plan to hand over ownership of the Chagos Islands, including the US air base on Diego Garcia, to Mauritius.

Fact check: Government calculations set out three cost estimates for Chagos deal - The measurements vary from simply totalling the agreed estimated payments to calculating the total cost of the 99-year treaty in today’s money.

Mauritius has affirmed its sovereignty over the Chagos Archipelago, countering a social media statement by former U.S. President Donald Trump. The country's claim is supported by international law, and they anticipate the swift execution of the treaty made with Britain to formalize the return of the islands.

The Chagos Archipelago is of major military significance as it hosts the strategically located Diego Garcia base.