He may not have used it before the Security Council but the State Department did issue a press release in December 02 that included the claim. This was, of course 9 months after the CIA operative had returned with the finding of bogus.
I cannot figure out how to post that document but I will email it to anyone who cares to see it. It is in pdf as an image so you cannot use the clip board to take out the text.
Hopefully by now you've seen much information about Joseph Wilson, who is NOT a CIA operative, btw, and his "report" was certainly not conclusive or the end of the matter. The fact remains that the U.S. and Britain are sure (Britain VERY sure, U.S. unable to substantiate enough to pronounce it true, yet) that Iraq was in fact seeking to obtain uranium in Africa.