The prime minister must handle Donald Trump with tact, but without flinching from a duty to confront falsehoods in the president’s worldview

It is hard to set expectations ahead of a summit with no useful precedent. British prime ministers have visited the White House before and in a wide variety of geopolitical contexts, but never has the hosting president been hostile to the transatlantic alliance. Never before could it be said that Washington’s foreign policy regarding European security was closer to a Moscow line than a London one.

Conventional platitudes about a “special relationship” and common values are of little use to Sir Keir Starmer in handling Donald Trump. History is not irrelevant, but on matters of substance – most urgently, a settlement to end the war in Ukraine – Mr Trump is behaving more like a mafia boss than a statesman. His method is to demand tribute in exchange for protection.