Mr Bolton - a well-known critic of the UN - was accused of bullying junior staff and trying to distort intelligence to fit his own views, but the White House said the charges were unfounded.

BBC: Accusations that Bolton is a poor manager have been denied

"These charges still remain just as unfounded, just as unjust, as they were before, " he said.

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Google Chief Executive Eric Schmidt said the charges of bias were unfair and unfounded.

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