London: The UK’s likely next prime minister, Boris Johnson, has hinted that his country’s ambassador in Washington could be replaced after a diplomatic row with US President Donald Trump worsened on Tuesday.

Trump took to Twitter on Tuesday to launch a broadside at Sir Kim Darroch, the UK ambassador to the US who has been embarrassed by the leak of a mass of diplomatic cables in which he was scathing of the "clumsy and inept" President and his divided administration.

The President retaliated by labelling Darroch "wacky, "a very stupid guy" and "a pompous fool" and he also mocked current Prime Minister Theresa May’s inability to seal a Brexit deal.

On Monday Trump said he "will no longer deal" with Darroch. The ambassador was disinvited from a state dinner at the White House and on Tuesday withdrew from a planned meeting between Ivanka Trump and the UK’s international trade secretary Liam Fox in Washington.