Scott Ritter, a former United Nations weapons inspector, has compared the invasion of Iraq to Hitler's invasion of Poland.
He told the Berliner Zeitung newspaper that 130 Americans had died "for a lie", adding: "I see no difference between the invasion of Iraq and the invasion of Poland in 1939."
Both invasions were based on what he said was an artificial argument of self defence. President George W Bush had used the September 11 attacks as Hitler used the 1933 burning of the Reichstag to repress domestic dissidents.
Mr Ritter, who resigned as an inspector in 1998 saying Saddam Hussein's regime was hindering his work, said he did not now believe there were weapons of mass destruction in the country.
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