Donald Trump has said he is 'very disappointed' in Sir Keir Starmer for initially refusing to allow the use of the UK-US Diego Garcia base to target Iran .
Last week, senior military figures urged Prime Minister Sir Keir Starmer to put national security first and let Donald Trump use British bases for an attack on Iran.
U.K. Parliament ratification of Chagos Islands sovereignty transfer to Mauritius remains uncertain as House of Lords considers legislation amid transatlantic tensions.
The shadow foreign secretary will use a speech in Washington on Wednesday to urge Donald Trump to stand firm in his opposition to Labour's Chagos Islands giveaway.
The UK has declined a US request to use British airbases, including RAF Fairford and Diego Garcia, for potential strikes on Iran, citing concerns over international law and legality.