The reason is clear to me, Iraq was not allowing in Nuclear Inspectors.
Perhaps Bush should have listened to the Nuclear Inspectors:
Here is the whole article:
This is an exerpt:
The IAEA’s Director General, Mohamed ElBaradei, and UNMOVIC’s Executive Chairman, Hans Blix, both reported progress, following the return of UN inspectors to Iraq in November 2002, in resolving critical questions about the current status of Iraq’s WMD programs.
Based on more than a hundred visits to suspect sites and private interviews with a number of individual scientists known to have been involved with WMD programs in the past, ElBaradei stated that the IAEA had “to date found no evidence or plausible indication of the revival of a nuclear weapons programme in Iraq” and predicted that the agency should be able to provide that Security Council with an objective and thorough assessment of Iraq’s nuclear related capabilities “in the near future.”
Blix reported that destruction of Iraq’s al Samoud ballistic missiles, which had exhibited ranges beyond that allowed by the UN, was underway. Concerning the status of Iraq’s chemical and biological weapons programs, Blix was less categorical. No stockpiles or active programs had been found, but it had not yet been possible to document destruction of all the weapons known to have been produced prior to the 1991 Gulf War. Blitz predicted that months but not years, would be needed to complete the job.
Washington Dismisses the Inspectors’ Findings
The Bush administration’s response to the inspectors’ reports was swift and negative, because their conclusions contradicted the allegations previously made by the U.S. government – for example, with regard to the 2002 National Intelligence Estimate on Iraqi WMD. The next day, President George W. Bush delivered a radio address to the American people, arguing that the inspection teams did not need any more time, because Saddam was “still refusing to disarm.”
Given Saddam Hussein’s “long history of reckless aggression and terrible crimes,” the United States needed to be willing to use military force rather than waiting “to see what [he] would do with weapons of mass destruction.”The Known “Knowns”
The IAEA and UNMOVIC inspectors provided an up-to-date, reality-based assessment of Iraq’s WMD programs before the U.S.-led invasion began. Their findings should have led to a careful reassessment of the by then out-of-date U.S. National Intelligence Estimate from October 2002 that Bush administration officials had cherry-picked to build a case for military action.