irresponsible. >> reporter: cnn has learned the intelligence community traced the hack back to specific keyboards with a cyrillic text, an alphabet used by russians, adding to confidence russia carried out the attack. last week, the fbi and dhs put out this report naming the hacking operation and calling out two russian intelligence groups for yoet the intrusion into a u.s. plit dal party. john mccain traveling in the baltic region where countries are most worried about russia's aggression says there's no doubt it was russia. >> all of our intelligence agencies will affirm that that be the case. we will work in the congress to have stronger sanctions in order to prevent further attacks on the united states of america. >> reporter: as we await the