Rupert Murdoch joined in an "over-crude" attempt by US Republicans to force Tony Blair to accelerate British involvement in the Iraq war a week before a crucial House of Commons vote in 2003, according to the final volumes of Alastair Campbell's government diaries.

In another blow to the media mogul, who told the Leveson inquiry that he had never tried to influence any prime minister, Campbell's diary says Murdoch warned Blair in a phone call of the dangers of a delay in Iraq. The disclosure by Campbell, whose diaries are serialised in the Guardian, will pile the pressure on Murdoch in light of his evidence to the Leveson inquiry.

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