According to the WP, the CIA considered the Africa report to be "sketchy." Furthermore, administration officials have never been provided with the source of Britain's information, which apparently was provided by an unidentified "third country." Early drafts of Bush's speech, however, included a mention of the uranium claim but did not initially source the British government for the information.
While USAT says the CIA successfully pressed for the Brits to be sourced, CBS News takes that one step further, noting that CIA analysts specifically warned the administration that the claim was false and shouldn't be included in Bush's speech. Citing "senior administration officials," CBS says the White House argued that as long as the statement was attributed to the Brits, it was factually accurate.