Joe Biden pushed the UK into giving up the Chagos Islands over concerns the US would lose control of an important air base, The Telegraph understands.

Days after the general election in July, senior officials from the White House’s National Security Council and State Department told the incoming Labour government that refusing to sign away the islands would jeopardise the “special relationship” with Washington.

Sir Keir Starmer was criticised last week for his decision to give up the archipelago of more than 1,000 tiny islands, a UK overseas territory since 1965 known officially as the British Indian Ocean Territory.

It was suggested the deal could give China access to the Diego Garcia air base, which is on the largest island in the chain.

Under the deal, Mauritius will take control of the islands, but Britain and the US will rent the base for 99 years.

Strategically important air base

The Telegraph understands that American officials pushed the UK toward the deal, fearing that if it was not signed, Mauritius would successfully apply for a binding ruling at the International Court of Justice (ICJ) to take control of the islands, effectively shuttering the air base.