Vice-President Dick Cheney and a handful of others had hijacked the government's foreign policy apparatus, deciding in secret to carry out policies that had left the US weaker and more isolated in the world, the top aide to former Secretary of State Colin Powell claimed on Wednesday.

In a scathing attack on the record of President George W. Bush, Colonel Lawrence Wilkerson, chief of staff to Mr Powell until last January, said: “What I saw was a cabal between the vice-president of the United States, Richard Cheney, and the secretary of defense, Donald Rumsfeld, on critical issues that made decisions that the bureaucracy did not know were being made.