Emily Thornberry today compared Donald Trump to a 'rogue dictator' as she tore into the US President for ramping up the threats against North Korea.
Labour's shadow foreign secretary said his threat to 'totally destroy' the Communist country 'is not what we need from the leader of the free world'.
She accused Theresa May of 'pathetically' trying to cosy up to the US President in 'sycophantic and spineless' display.
And she mocked Boris Johnson jibing that he should go on the Jeremy Kyle show and take a Brexit paternity test to face up to his responsibilities.
Emily Thornberry, pictured today at the Labour Party conference, slammed Donald Trump and Boris Johnson during her fiery speech at the Labour Party conference
Ms Thornberry, a close ally of Jeremy Corbyn, laid into the men as she delivered her speech at the party conference in Brighton today.
She said the world is facings its biggest challenges since the 1930s - pushed to the brink by the war in Syria and Yemen, human rights violations in Mayanmar and civil unrest in Venezuela.
The new US ambassador to Britain has backed Brexit.
Robert Johnson, known as Woody, said, said he trusts the British people to decide their own destiny.
Mr Johnson , who has recently been appointed to the diplomatic role by Donald Trump, told the Telegraph he supports the UK leaving the Brussels club.
He said: 'I trust the British people to make the right decision and I feel comfortable that you made the right decision.'
And he said Britain is one of Europe's most important trading partners and it is in the interests of the bloc to strike a good trade deal.
He said: 'The UK is a great customer of Europe.
'It is one of the best customers, and you need to treat your customer right. It is pretty logical once you get over all the emotions.'
He added: The UK should have the freedom to control movement over its borders. I think it can be worked out. I am pretty optimistic.'
And she said the growing threat of a nuclear-armed North Korea has 'terrifying consequences' for the world.
But she lashed Mr Trump, accusing the President of believing he can flout international rules which help foster peace.