Transcript for Hillary Clinton to Testify in High-Stakes Benghazi Hearing
We'll turn to Hillary Clinton and today's capitol hill showdown over benghazi. It will be an all day grilling for the front-runner hearing her allies calling it a political witchhunt. Jon Karl with the latest. Good morning, Jon. Reporter: Good morning, George. This is a tremendously high stakes moment for Hillary Clinton. She will spend the entire day before a committee that has spent nearly a year investigating the biggest single crisis that she faced as secretary of state. This morning, Hillary Clinton will take the hot seat before the special house committee investigating the 2012 benghazi attacks. For at least eight hours Clinton will face tough questions from the committee's seven republicans and five democrats. About the biggest crisis she faced as secretary of state. I don't know that I have very much to add. This is, after all, eighth investigation. Reporter: In 2012 less than two months before the presidential election, a terrorist assault on the U.S. Diplomatic outpost in benghazi, Libya, left four Americans dead. For the first time in 33 years, a U.S. Ambassador was killed overseas. Was it because of a protest, or was it because of guys out for a walk one night who decided to kill some Americans? What difference at this point does it make? Reporter: That was Clinton nearly three years ago. The day republicans leading the inquiry want more answers. What I want to know is while violence was going up in Libya why was our security profile going down? Reporter: A majority of Americans, 54% disapprove of Clinton's handling of questions around benghazi but as nearly believe republicans are using the investigation to damage her reputation. She stood strong for America but now republicans are playing politics over benghazi. Reporter: The super pac backing Clinton's campaign is now airing its first after ad calling the hearing a sham. Republicans on the committee insist they are not out to get Hillary Clinton and that they will keep their questions focused on what happened in the time leading up to and during the attack in benghazi. Now, the Clinton campaign is out with something right now previewing her opening statements saying that she will in that statement give honor to the memory of the four brave Americans who died in benghazi and that, quote, benghazi was a tragedy that we must all learn from. Amy. All right, Jon, thank you.
This transcript has been automatically generated and may not be 100% accurate.