forming an impenetrable cyber security unit with russia to guard against the threat. >> i'm sure vladimir putin could be of enormous assistance in that effort since he's doing the hacking. >> reporter: facing backlash, president trump reversing course 12 hours later tweeting, the fact that president putin and i discussed a cyber security unit doesn't mean i think it can happen. it can't, but a cease-fire can and did. >> it's not the dumbest idea i've ever heard, but it's pretty close. >> reporter: president trump also insisting sunday that he strongly pressed president putin about russian meddling during friday's meading, but not indicating if he accepted putin's vehement denial saying only, i've already given my opinion. >> i think it was russia, but i think it was probably other people and/or countries and i see nothing wrong with that statement. nobody really knows. >> this after the russian foreign minister said friday that president trump heard and accepts putin's denial, a claim