Kim Darroch has resigned as Britain's ambassador to Washington following a row over leaked emails criticising US President Trump.
"Since the leak of official documents from this Embassy there has been a great deal of speculation surrounding my position and the duration of my remaining term as ambassador," he wrote in his resignation letter, adding that it had made it "impossible" for him to do his job.
Trump had labelled him "stupid" and "wacky" after memos from Darroch had branded the US leader's administration "clumsy and inept".
UK Prime Minister Theresa May expressed "great regret" at his resignation.
Trump postpones military strikes on Iranian power plants
Pilot, co-pilot killed after passenger jet hits fire truck at LaGuardia airport
Kuwait launches probe into espionage, state security cases
Trump, Iran threaten to escalate conflict with attacks on energy and water facilities
Fuel reservoir in Russia's Primorsk port on fire after drone attack, governor says
Ambulances from Jewish community organisation torched, UK police say
Israeli airstrikes kill four in Gaza, Palestinian officials say
Iran says Hormuz open to all but ‘enemy-linked’ ships
