Keir Starmer is engaged in frantic diplomacy over the Iran crisis today as Donald Trump sounds an increasingly strident message.
The PM and president spoke last night after the US strikes on Tehran's nuclear sites. But Downing Street's readout notably did not include any reference to the 'de-escalation' Sir Keir has been urging in other statements.
Instead No10 said the leaders agreed Iran must not be allowed to develop a nuclear weapon and should return to negotiations.
Soon after the call Mr Trump took to social media apparently endorsing regime change - swiping that it could be time to 'Make Iran Great Again'.
The stance raises fresh questions about Sir Keir's influence and the health of the Special Relationship. After meeting Mr Trump in person at the G7 in Canada last week, the premier had insisted he did not believe the US would go ahead with the attacks.
