“I think the message that was intended is that the US needs the UN, and the UN needs the US, and we need to support each other,” Mr Annan said. “I think the speech by my deputy should be read in the right spirit and let’s put it behind us and move on.”

Mr Annan, under fire from Republicans, began a UN reform drive and sought advice from his American friends, predominantly Democrats. After a secret meeting at the home of the Clinton Administration’s UN Ambassador, Richard Holbrooke, Mr Annan named Mr Malloch Brown as his chief of staff in January last year.

The appointment raised eyebrows when it was reported that Mr Malloch Brown was renting a house on George Soros’s estate for $2,500 a month less than the previous occupant. Even before Mr Bolton was named US Ambassador, he seemed destined to clash with Mr Malloch Brown. Mr Soros, Mr Malloch Brown’s landlord and old friend, helped to fund the Stop Bolton campaign, aimed at stopping him from getting the post.

Mr Malloch Brown has been criticised by dissident UN staff for aligning the world body too closely with Democrats in US domestic politics. They accuse him of allowing a UN staffer, Justin Leites, to play a leading role in the 2004 presidential campaign of John Kerry, violating staff rules. It is a charge that he denies. “I don’t consider myself aligned with any American political establishment,” he said. “I am British. I have worked in the UN and in international jobs all of my life.”