In fact the resignation was probably inevitable from the moment his comments about the Trump administration were leaked to the Press.
In the leaked documents Darroch questioned whether the White House "will ever look competent".
The US leader branded Britain's ambassador as "wacky,"a very stupid guy", despite declaring that he didn't know him, "but have been told he is a pompous fool".
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.
"Indeed the friction is likely to increase, because Johnson will now need to live down his reputation as Trump's poodle".
Trump was given the red-carpet treatment during a state visit to Britain last month, but there are tensions over his policies towards Iran and China. May also seemed to give an implicit criticism of President Trump, referring to the importance of "defending out values and principles, particularly when they are under pressure".
He was simply doing what he was paid to do. "Standing up for Britain means standing up for the finest diplomats on the world".
In response to Darroch's letter, Sir Simon McDonald, Permanent Under Secretary at the Foreign and Commonwealth Office, said the former Ambassador had been the target of a "malicious leak". A day beforeDarroch's resignation Downing Street said he 'continues to have the primeminister's full support, adding that 'we have made clear to the USA howunfortunate this leak is and that 'the selective extracts leaked do notreflect the closeness of, and the esteem in which we hold, the relationship. Contacts have to be cultivated over a period of time and trust established.
Carnegie's Burns, who was serving as the third-ranking US diplomat at the time, recalled that the leaks had "negative practical implications" for the day-to-day conduct of embassies.
What was the leaker's motivation? The first is Sir Kim Darroch and his team at the UK's embassy in the USA.
Johnson was asked repeatedly by fellow leadership candidate Jeremy Hunt whether he would keep Darroch in the post if he became prime minister, but refused to answer.
Johnson, a former foreign minister, repeatedly failed to back Darroch during a televised debate late on Tuesday.
But Trump supporter and Brexit Party leader Nigel Farage described the resignation as, "the right decision".
The leaked cables were intended for the eyes of senior British ministers and civil servants, but officials believe the leaker will be found among British politicians or officials, not a foreign government. During the past hard three years, civil servants have fulfilled their traditional role of serving the government of the day to the very best of their ability. Will it be a professional diplomat?
Such was the embarrassment of this first tweet that the United Kingdom government - via 10 Downing Street - had to put out a formal but firm statement noting that the United Kingdom government, not the US, appointed its own ambassadors. Such appointments are not unprecedented. It is being viewed by many as the final straw for the ambassador as he made up his mind to resign. Foreign Relate of labor asserting his resignation, Darroch said that the "present bellow is making it not doubtless for me to steal out my aim".
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