recently spoken with bob mueller as well as the fbi several timd. and of course he denies that he was involved in any collusion with the russians, wolf. >> all right. manu, thanks very much. manu raju reporting for us. let's get some more on all of this. democratic senator ben cardin of maryland is joining us. he's the ranking member on the senate foreign relations committee. senator, thanks for joining us. >> wolf, it's good to be with you. is this, what we just heard, is this evidence of collusion? >> well, it's certainly very troublesome. we know that there is direct contact and we know that donald trump jr. talks about, perhaps the russian sanctions issue. so these are very troublesome contacts and we need to see what the investigation comes forward. >> when do you believe that president trump himself may have learned about this coordinated russian outreach? >> well, we don't know that. we don't know exactly how much was shared, with donald trump