Hamre, who was Bill Clinton’s deputy defence secretary in the 1990s, has been highly critical of the conduct of the war on terror. In The Washington Post last year he wrote: “The policies that led to Guantanamo Bay, Abu Ghraib, secret renditions and warrantless wiretaps have undermined America’s towering moral authority.”

Clinton has been sidestepping calls to pull US troops out of Iraq if she wins, sticking to a broader promise to begin a phased withdrawal. In a recent television interview, the New York senator refused to state that all US combat troops would leave Iraq by the end of her first term in office. She voted in the Senate last month to designate the Iranian Revolutionary Guards a terrorist organisation.

[Richard "Prince of Darkness"] Perle believes that Clinton might be prepared to order military strikes against Iran if President Mahmoud Ahmadinejad takes Tehran’s nuclear programme to the brink. "If President Clinton is informed in March 2009 that we’ve got ironclad intelligence that if we don’t act within the next 30 days it’s going to be too late, I wouldn’t begin to predict what she would do,” Perle said. “Nobody wants to act before it is absolutely essential . . . but things can change very quickly.”

Bush believes Clinton will win the Democratic nomination and has privately advised her not to voice antiwar rhetoric on Iraq that she may come to regret.

The Treasury, under Henry “Hank” Paulson, has also been appointing Democrat supporters to senior positions. Robert Novak, the conservative columnist, reported that Paulson last week named Eric Mindich, a leading Democratic fundraiser, for a key role as an adviser on financial markets. One Republican in the Bush administration wrote disapprovingly in an e-mail: “This leads some to wonder whether this Treasury has become the preplaced Hillary Clinton team.”