Starmer, a cautious center-left politician, has avoided directly contradicting Trump or criticizing his actions. The U.K. joined the U.S. in refusing to sign a joint declaration at an Artificial Intelligence summit hosted by Macron in Paris this month in what was seen as an attempt to curry favor with Washington.

French President Emmanuel Macron and British Prime Minister Keir Starmer will visit Washington next week, amid other meetings aimed at bringing an end to Russia's war in Ukraine, U.S. national security advisor Mike Waltz said on Wednesday.