Sir Keir Starmer and Donald Trump have spoken for the first time since the US president angrily criticised the UK's Iran response.
No 10 released limited details of the call, saying the two leaders discussed the situation in the Middle East and military cooperation between the UK and US.
On Saturday, the president said the UK was considering sending aircraft carriers to the Middle East but dismissed the prospect, writing on social media "we don't need people that join Wars after we've already won!" - while labelling Britain "our once great ally".
Sir Keir has previously said the UK would not join offensive actions, but agreed to let the US use British bases for defensive strikes on Iranian missile sites.
Trump has repeatedly expressed his frustration at the prime minister after he refused a US request to use UK bases for initial offensive strikes against Iran.
