the company he was on the board of with him just once. dad said i hope you know what you're doing, and i said i do. bill, cnn has investigated. others have investigated. there's no evidence of any wrongdoing by either bidep. do you think joe biden should be worried this could be worried against him? does it even matter? >> no, that's not a real discussion, and even if it were, it doesn't matter. joe biden is not president of the united states. whatever joe biden and hunter biden did could be investigated, i suppose. it has been investigated by paris authorities incruding the ukrainian government and the media. the trump administration controls it justice department. i suppose they could investigate it, too. it doesn't matter what trump did is wrong, it doesn'ter matter whether hunter biden or joe biden had one conversation or zero or five conversations. >> david gergen, you're sticking around with bill crystal. thank you so much for joining me tonight. all right, well, coming up, intense heat waves, devastating storms and melting ice. a sobering assessment of the climate crisis as scientists