According to Ritter, between 90% and 95% of Iraq's weapons of mass destruction were destroyed by the U.N. He believes the remainder were probably used or destroyed during “the ravages of the Gulf War”.

Ritter has described himself as a “card-carrying Republican” who voted for George W Bush. Nevertheless, he has called the president a “liar” over his claims that Saddam Hussein is a threat to America.

Ritter has also alleged that the manufacture of chemical and biological weapons emits certain gases, which would have been detected by satellite. “We have seen none of this,” he insists. “If Iraq was producing weapons today, we would have definitive proof.”

He also dismisses claims that Iraq may have a nuclear weapons capacity or be on the verge of attaining one, saying that gamma-particle atomic radiation from the radioactive materials in the warheads would also have been detected by western surveillance.

The U.N.'s former co-ordinator in Iraq and former U.N. under-secretary general, Count Hans von Sponeck, has also told the Sunday Herald that he believes the West is lying about Iraq's weapons programme.