Hillary Clinton Discusses Private Email, Donald Trump, Iran

In an interview with ABC News' David Muir, Clinton called using a personal email account a "mistake."
5:58 | 09/09/15

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Transcript for Hillary Clinton Discusses Private Email, Donald Trump, Iran
Presidential candidate Hillary Clinton has survived her share of scandals, but facing an upcoming date with congress to testify about her private e-mail server some are wondering if this might be her undoing. Tonight, Clinton gets candid in an exclusive interview with David Muir. Secretary Clinton, thank you. Thank you, David. When voters were asked, what is the first word that comes to mind when you think of Hillary Clinton, words like liar and untrustworthy were at the top of the list. Does this tell you that your original explanation about the private server, that you did it could carry one phone out of convenience, that this didn't sit well with the American people? Well, I don't like hearing that. I am confident by the end of this campaign people will know that they can trust me and that I will be on their side and will fight for them and their families, but I do think I could have and should have done a better job answering questions ier, as I look back at it now, even though it was allowed. I should have used two accounts of the one for personal, one for work-related e-mails. That was a mistake. I'm sorry about that. I take responsibility. And I'm trying to be as transparent as I possibly K I am looking forward, finally, to testifying before congress. Something I've been asking for for nearly a year. And, so, as you sit here, millions watching tonight. Mm-hm. Did you make a mistake? I erstand why different agencies have different views, and I respect that. It does not change the fact that I did not send or receive any information that was marked classified at the time. At the time marked classified. Mm-hm. But let me ask you, for the rest of us, the average voter and average viewer out there who might wonder, how can some of these e-mails be classified and labeled as top-secret today. Mm-hm. What changed in them so significantly that you wouldn't have seen red flags even just a couple years ago as secretary of state, that you of all people would have known. Yeah, that's a very fair question. And I think there are a couple of answers. One, sometimes events do proceed in a way that maybe there's a case being brought against somebody, maybe even a terrorist. And all of a sudden everything is classified. But North Korea's nuclear program, wouldn't that be classified? There's a lot of public information about their nuclear program. I don't know the specifics about the one that they are claiming is classified. She makes it clear this is not a criminal investigation. We then ask her about the other news of the day, Joe Biden. Voters chanting this weekend, run, Joe, run. You were once ons the same team inside the white house. You would often have breakfast with the vice president. Would he make a good president? Well, I like Joe Biden a lot. And I think he is a great vice president. If he gets into this election, there'll be lots of time to talk about, you know, what he wants to do. Would he make a good president? Well, you know, I think he could be a good president. There's no doubt about that. He says he deserves to test the waters, and then another candidate. Donald Trump. I want to read you something Jeb bush's son recently tweeted. Can't wait for this summer reality TV show to be over. That's cute. But is it a reality show? Or are we witnessing something real here? Well, that's going to be up to the republicans and the republican primaries to determine. You know, I'm always a little amused when people get into politics and they think that all you have to do is give speeches and the more colorful you are, the more dramatic, the more vehement you are, that's leadership. Do you think Donald Trump is just a leader of rhetoric and speeches? Well, he won't tell you how he would do anything. I want to know in your most private of moments, is there ever an instance when you ask yourself, why am I doing this again? Yes. Of course. Because it really is hard. And it's, it's something that, you know, just demands everything. Physically, emotionally, spiritually. It is just 24/7. I cherish and love this country. It gave me, you know, opportunities far beyond anything my mother, my father could have had. Is your mother's voice in your ear? And if so, give me one line that you repeat to yourself. As you probably know, my mother had a terrible childhood. She was abandoned by her parents, rejected by her grand parents. She was literally working as a housemaid at the age of 14. And she told me every day, you've got to get up and fight for what you believe in, no matter how hard it is. And I think about her a lot. I miss her a lot. I wish she were here with me.did. I did. As I said, it was allowed. And there was no hiding it. It was totally above board. Everybody in the government I communicated with, and that was a lot of people, knew I was using a personal e-mail. But I'mry Sor that it s,ha Y Ou ,own rdseaill a these questions. I do take response having made what is clearly not

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

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