Powell has become increasingly outspoken about the level of violence in Iraq, which he believes is in a state of civil war. “The civil war will ultimately be resolved by a test of arms,” he said. “It’s not going to be pretty to watch, but I don’t know any way to avoid it. It is happening now.”

He added: “It is not a civil war that can be put down or solved by the armed forces of the United States.” All the military could do, Powell suggested, was put “a heavier lid on this pot of boiling sectarian stew”.