Transcript for Sen. McCain asks James Comey about 'that thing'

In the case. Hillary Clinton. You made this statement that. There wasn't. Sufficient. Evidence to bring suit. Against her although it'd been very. Terrorists in their behavior put you didn't reach a conclusion. In that case that it was not a necessary to. Further pursue her. Yet at the same time in case. Mr. call me. You said that there was not enough information to make. It conclusion. Telling the difference between your conclusion is foreigners. Former Secretary Clinton is concerned and and mr. mr. trump. The Clinton investigation was a completed investigation that. The FBI I've been deeply involved in and so right opportune understand all the facts. And apply those facts against the laws I understood them this investigation was under way. Still going when I was fired so it's no where near in the same place Lisa wasn't when I was. What is still ongoing. Correct use of ours I know it was when I left. That investigation was going this investigations going on you reach separate conclusions. No that was done that I have only had investigation of any involvement. Secretary Clinton ordering universal shoots his completed. Yes as of July the fifth. The FBI completed its investigative work and that's what I was announcing what we have done what we have found. Well at least in the minds who have this member there's a whole lot of questions remaining. About what we're not particularly. Considering the fact that if you mention its quote a big deal. As to what went on during the campaign. So. Glad you concluded that part of the investigation but I. I think that the American people have a whole lot of questions out there particularly since you just emphasized the role Russia played. And obviously she was a candidate for president at the time so she was clearly involved. In this whole. The situation where. Fake news. As you just described it big deal. Took place at a you gonna have to help me out here look another word shall we are complete the investigation of anything that former Secretary Clinton had to do with the campaigns over and we don't have to worry about it anymore. With respect to certain enough I'm a little confuse senator respect to Secretary Clinton. We investigated. Criminal investigation in connection with her use of a personal email serve I understand and that's the investigation I announce inclusion of and July 5. So put him the same time you've made the announcement there would be no from. Charges brought against. Then Secretary Clinton four in the activities they involved. In the Russian involvement in our. Engagement and our election I don't I don't quite understand. How you could be done with that but not completely done. With the whole investigation and their attempt to it affect the outcome of our election. No I'm sorry if we're not at least when I left when I was fired I made the night there was still an open active investigation to understand the Russian efforts. And whether any Americans work for them. But he reached the conclusion. That there was no reason to bring charges against Secretary Clinton so you reached a conclusion. In the case of missed call me. You. Depression. Call me it serves me cook case approaching trial. You. Have been an ongoing investigation. She got one candidate. Who you're done with and another candidate that you have a long way to go. Should current. I don't know how far they've the FBI has to go but yes that the Clinton email investigation is completed the investigation of Russia's efforts a connection with the election. And whether there was any coordination. And if so with whom is getting ready in the campaign he just was ongoing when I left. You just made it clear what he said this is a quote a big deal and quote. That and I think. It's hard to reconcile. Your one location may reach complete conclusion and the other side you have you have not and you can. In fact obviously. There's a lot who were there issues as we know. As you called it a quote big deal she's one of the candidates but in her case she say there will be no charges and the case. President trump there at the residents of the investigation continues. What has been brought out in this hearing his is more and more emphasis on the Russian engagement and involvement in this campaign. How serious. Do you think this was. Very serious but at components Asem meet clear. There was we have not announced and there was no provocation to announce an investigation of whether the Russians. May have coordinated with secretary Clinton's campaign. Secretary Clinton's Carroll didn't. Did they may not have been involved for their campaign they were involved with the entire presidential campaign obviously of course assert and that that is an investigation. That began last summer insofar as I'm aware continues. So both. Present. Trump and former candidate. Clinton. Are both involved in the investigation yet one of them you said there's going to be no charges in the other one that the investigation continues well. I think I think there's a double standard there and tell you the truth. That when the president said TV talk about the April 11 phone call and he said quote because I've been very loyal to you very loyal. We had that thing you know. Is that a Rauscher curiosity is what quote that thing was guess. Why didn't ask it. We didn't seem to me to be important for the conversation we're having to understand it. I took it to be some. An effort to. Two. Communicate to me this that there is a relationship between us where I've been good do you ye should be good to me. Yeah but out I think it would intensely aroused Mike. That curiosity if the president and I states and we had that thing you know I'd like to know what they held I think he has particularly if I'm the director of the FBI. Yeah and I get that senator honest tell you what this is speculation or what I concluded at the time is in his memory he was searching. Back to our encounter at the dinner. And was preparing himself to say I offered loyalty promised loyal to demand all of a sudden his memory showed him that did not happen. And I think he pulled up short that's just to get expedite iPad lot of conversations with humans over you. Think I would have some curiosity if it had been about me and be honest with yet. So are you Wear any thing that will believe you to believe that the president. Members of the administration are members of the campaign. Could potentially be used to coerce or blackmail Lee administration. That's a subject for it investigations. Not something I can come and I'm sitting here. But you reached that conclusion as far as Secretary Clinton was concerned. But you're not reaching a conclusion as far as this administration. It is concerned. Are you Wear anything that would lead you to believe that information exists. That could. Or coerce members of the administration or blackmail the administration. That's not a question I can answer senator George times expert.

This transcript has been automatically generated and may not be 100% accurate.