Robert Gates, the US defence secretary, has taken charge of the forces in the American government opposed to a US military attack on Iran, writes Tim Shipman.

Pentagon and State Department officials say Mr Gates has set himself up as chief rival to Dick Cheney in a bid to thwart the vice president’s desire to bomb the Islamic state.

Those familiar with internal battles in the Bush administration say Mr Gates has eclipsed Condoleezza Rice, the secretary of state, as the chief opponent of air strikes and is the main reason President George W.Bush has yet to resort to military action.

Pentagon sources say Mr Gates is waging a subtle campaign to undermine the Cheney camp by encouraging the army’s senior officers to speak frankly about the overstretch of forces, and the difficulty of fighting another war.

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