John Nixon had numerous conversations with the deposed leader and now says that America was critically mistaken about their intervention Iraq in a number of ways.
In particular, he claims, the CIA’s view of Hussein’s attitude to using chemical weapons was wrong.
They were also mistaken about his health, personal habits and his involvement in running Iraq.
Mr Nixon also criticised the conduct of George W Bush, under whose leadership America invaded Iraq, saying the former president heard “only what he wanted to hear” on the topic.
During the interrogations, Mr Nixon asked Hussein if he’d ever thought of engaging in a pre-emptive strike with WMDs against US troops based in Saudi Arabia.
According to Mr Nixon, writing in the Mail on Sunday, the former dictator’s reply was: “We never thought about using weapons of mass destruction. It was not discussed. Use chemical weapons against the world? Is there anyone with full faculties who would do this? Who would use these weapons when they had not been used against us?”