British politicians from both government and opposition parties have accused Johnson of spinelessness for failing to defend envoy Kim Darroch, and said the removal of a British ambassador because of pressure from a foreign leader was a severe blow to British diplomacy and power.
"I think it's very important we should have a close partnership, a close friendship with the United States", Johnson said.
According to Senator Lindsey Graham, the leaked messages from the former British ambassador about President Trump are "bad for diplomacy". The resignation followed President Donald Trump's furious caustic response to the leaked cables in which Darroch offered candid negative views of his administration.
After learning of Darroch's assessment, Trump responded on Twitter by calling Darroch "a very stupid guy" and a "pompous fool".
"I want to put an end to that speculation", he added". "The current situation is making it impossible for me to carry out the role as I would like".
In his resignation letter, Darroch said his position was no longer tenable.
Darroch, one of the UK's most senior and well-respected diplomats in one of the foreign service's most high-profile jobs, was simply doing what the FCO pays him to do - giving his opinion on the government and functioning of his host country.
Boris Johnson, the frontrunner to become prime minister, said that Darroch is a superb diplomat and that public servants should not be dragged into the political agenda.
Mrs May said Sir Kim was owed "an enormous debt of gratitude" and his departure was "a matter of deep regret", but President Trump was much less complimentary in his comments about the former ambassador. Public servants should be able to give "full and frank advice", she added.
"If the United Kingdom allows the civil service and diplomatic corps to be politicized or.to feel that the opinions that they express are going to destroy their careers because they're out of sync with the prevailing orthodoxy, the United Kingdom would lose a very important asset", says Gardner.
Darroch's term as Britain's chief diplomat in the US was set to conclude later this year. Mr. Trump not only lashed out at Sir Kim, he also said that the White House would no longer deal with the diplomat, effectively cutting off his Washington contacts. Whatever sanctimonious expressions of regret he mouths, and however much he blames the leaker, King Charles Street knows the Conservative leadership candidate effectively sacked Darroch on the orders of the president.
Speaking on the BBC's Newsnight programme, Mr Raab, who is backing Mr Johnson in the Conservative leadership contest, labelled Sir Kim's comments as "wrong" and claimed diplomatic cables should not include personalised remarks.
Sir Kim resigned because he was anxious that "as long as he remained in Washington he would be a target, and his family with him", he added. During the debate, Hunt vowed to keep Darroch in the post, but Johnson - his predecessor as foreign secretary - failed to support the British envoy.
"Johnson hates Russian Federation, hates Syria and shares all the prejudices of the United States establishment", Ford said.