That's why Wilson had to be shut down.

Jason Leopold:

"Eleven days before President Bush's January 28, 2003, State of the Union address in which he said that the US learned from British intelligence that Iraq had attempted to acquire uranium from Africa - an explosive claim that helped pave the way to war - the State Department told the CIA that the intelligence the uranium claims were based upon were forgeries, according to a newly declassified State Department memo.
The revelation of the warning from the closely guarded State Department memo is the first piece of hard evidence and the strongest to date that the Bush administration manipulated and ignored intelligence information in their zeal to win public support for invading Iraq. On January 12, 2003, the State Department's Bureau of Intelligence and Research (INR) "expressed concerns to the CIA that the documents pertaining to the Iraq-Niger deal were forgeries," the memo dated July 7, 2003, says.

Moreover, the memo says that the State Department's doubts about the veracity of the uranium claims may have been expressed to the intelligence community even earlier.
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"This was the very first time there was written evidence - not notes, but a request for a report - from the State Department that documented why the Niger intel was bullshit," said one retired State Department official.

"It was the only thing in writing, and it had a certain value because it didn't come from the IAEA. It came from State. It scared the heck out of a lot of people because it proved that this guy Wilson's story was credible. I don't think anybody wanted the media to know that the State Department disagreed with the intelligence used by the White House. That's why Wilson had to be shut down."