Transcript for Hillary Clinton Testifies About Benghazi
Let's get right to it. Hillary Clinton testifying at this hour. More than eight hours now since she began answering questions. Asked about what led up to that deadly day in benghazi. Did she do enough to protect Americans? But after 17 months and nearly $5 million in taxpayer money on this investigation, democrats furious today. Questioners began bickers with each other as Clinton watched. It all began this morning as she left her Washington home, her husband, former president bill Clinton sending her off. Tonight, the key points. We what never heard before. Including the e-mail that Chelsea Clinton, using Ann salias for her daughter. ABC's Jonathan Karl. Reporter: With huge crowds lining the hallways outside, from the start, the republican chairman was defensive. Mad dam secame secretary, I understand. There are people in both parties that have suggested that investigation is about you. Let me assure you it is not and let me assure you why it is not. This investigation is about four people who were killed representing our country on foreign soil. Reporter: And the top democrat on the attack. Republicans are squandering millions of taxpayer dollars on this abusive effort to derail secretary Clinton's presidential campaign. Reporter: Republicans released a never before seen e-mail. It was addressed to Diane Reynolds. The name she used for e-mails sent to her daughter, Chelsea. Two of our officers were killed in benghazi by an Al qaeda-linked group. That's quite different than what the Obama administration said in the days after the attack that killed four Americans including ambassador Chris Stevens. That it was a son tan use protest over an anti-islamic video that groovy lent. You tell the American people one thing. You tell your family a different story. Why didn't you just speak plain to the American people? Well, congressman, there was a lot of conflicting information that we were trying to make sense of. The situation was very fluid. It was fast-moving. Reporter: Republicans demanded to know why the state department had denied requests for more security in the months before the attack. Can you account for why that is? Why we had requests and no increase in security? Well, congressman, I can only tell you that I know a number of requests were fulfilled. And some were not. Reporter: Mrs. Clinton took responsibility for what happened as she has in the past. I would imagine I thought more about what happened than all of you put together. I've lost more sleep than all of you put together. I have been wracking my brain about what more could have been done. Reporter: Republicans came with printouts of Clinton's e-mails related to Libya. And asked why there were so few in the months before the attack. Implying that she was not paying attention. Libya, benghazi, Chris Stevens, the staff there, they seemed to fall after your radar in 2012 and the situation is getting much worse. Well, congresswoman, I did not conduct most of the business that I did on behalf of our country on e-mail. I conducted it in meetings, I read massive amounts of memos, great deal of classified information. I made a lot of secure phone calls. I was in and out of the white house all the time. Reporter: And again and again, republicans pressed her about her e-mails from her old friend, Sidney Blumenthal. Help us understand how Blumenthal had that kind of access to you, but the ambassador did not. Reporter: That line of questions made democrats furious and the two sides started fighting with each other. I tell you what. The whole truth, and nothing but the truth? That's what we want to have. Let the world see it. Why is it that you only want Mr. Blumen that's Tran script released? Reporter: Hillary Clinton just looked on. And Jon Karl with us live on capitol hill tonight. Jon, you were in the room today and that new ABC news poll. A majority of Americans saying before today, they disapproved how police Clinton handled questions about this. There was something veelse very telling. 53% believe republicans are out to damage her reputation. How does her team think she's done so far? Reporter: The team seem quite pleased. If republicans were hoping to draw blood, they really didn't succeed in the face of relentless questioning, Hillary Clinton was calm, she was sober. When they tried to engage her in political fights, she simply didn't take the bait. And Jon, we reported the Numbers at the top. 17 months now, costing nearly $5 million. We heard two democrats, that familiar democratic argument today, why only Hillary Clinton testifying. They asked, where is the head of the cia, where's the secretary of defense? Reporter: Well, the committee chairman says he plans to call more witnesses, about 20 more. Unclear exactly who those will be. But they have interviewed more than 50 witnesses so far and it's not surprising that the secretary of state would be the senior witness. After all, she was ultimately responsible for that diplomatic outpost and the ambassador that was killed reported to her. Jon Karl, thanks. There is another major story we're following tonight.
This transcript has been automatically generated and may not be 100% accurate.