Bad intel based on one source?
No.
A combination of forged documents and a lying informant.
Niger uranium forgeries
https://en.wikipedia.org/wiki/Niger_uranium_forgeries
Curveball (informant)
https://en.wikipedia.org/wiki/Curveball_%28informant%29
In a February 2011 interview with the Guardian he “admitted for the first time that he lied about his story, then watched in shock as it was used to justify the war.”