tonight. back with david gergen, john dean and laura coats. if both forward and cavanaugh stick to their stories and there isn't some kind of investigation it, basically just -- and both testify publicly, it just ends up being a question of who do the senators believe. >> correct. again, this is not a fact finding investigation. they're a political panel. their role is supposed to be to say who do we believe a credibility assessment. when you have a he said, she said, what will help everyone if you actually had corroboration on either side to bolster the credibility of the accuser or the person accused. so the investigation as the attorney for dr. ford said was the hearing should not be a substitute for an investigation. it should not be the only source that the senators have to assess the credibility. we do this all the time in courtrooms. i used to specialize in delayed reporting sexual assault cases where you had he said he said or