<prompt> Translate the following text to EnglishLakini msemaji huyo alisema kampeni hiyo haijaandaa jibu kwa changamoto ya mgombea Bill Bradley kwamba Gore atoe kitabu hicho kwa maabara ya kujitegemea kwa ajili ya kupimwa.  <response>: But the spokesman said the campaign had not yet formulated a response to candidate Bill Bradleys challenge that Gore submit the paperback to an independent lab for testing. 