Britain's ambassador to Washington has quit following a stinging attack from Donald Trump.
The US president called Sir Kim Darroch "very stupid" after leaked memos showed the ambassador calling Trump "inept".
Tory leadership frontrunner Boris Johnson has refused to offer the embattled ambassador his support.
One News US correspondent Rebecca Wright told Andrew Dickens Darroch had no choice but to fall on his sword.
"Nobody will deal with him in Washington DC. He is essentially persona non grata. He had no choice but to put his tail between his legs and head back to the United Kingdom.:
She says the case will make other diplomats scared about being free and frank.
"I'm sure there is bound to be other colourful descriptions of this President and his administration being exchanged between diplomats and their home country at the moment."