US President Donald Trump has voiced opposition to the United Kingdom's planned return of the Chagos Islands to Mauritius, citing potential geopolitical instability with Iran. Trump argued on Truth Social that the United States might require access to Diego Garcia, a key island within the Chagos archipelago, to counter a possible attack from Tehran should current negotiations, including those concerning Iran's nuclear program, fail. He urged Prime Minister Starmer not to relinquish control of Diego Garcia, emphasizing the importance of the base for US-UK security cooperation and suggesting Fairford airfield in the UK could also be utilized for defense.