By contrast, Bush's approval ratings remain high in US polls, which also show that most of the public seems not overly concerned about the lack of progress in finding banned Iraqi weapons.
Bush has expressed less certainty in recent days about the existence of massive arsenals, focusing instead on the discovery by allied forces of two truck trailers that the CIA contends could have been used for manufacturing biological weapons.
"We're on the look. We'll reveal the truth," Bush said last week.
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