Hillary Clinton to Testify on Benghazi Attack And as you know, there was someone else listening to the president's speech yesterday. Secretary of state hillary clinton. And we have learned she is getting ready tonight for her long-awaited appearance tomorrow before congress, over the tragedy at the u.S. Consulate in benghazi. Abc's chief global aff correspondent martha raddatz has that story. Reporter: Hillary clinton seemed all business yesterday. No heels, no contact lenses, as she held tight to husband bill, carefully navigating the stairs on the way to the ceremony. The secretary did not take the arm of her military escort but the clintons could be heard saying to the escort -- just in case. Reporter: They appreciated that he was there, just in case. Hello! Reporter: Moments later, she was on her own, all smiles, no sign of any residual effects from that nasty concussion. But tomorrow, returning to capitol hill, her headache may be back, as he faces what may be a brutal day. The long postponed hearing on benghazi and the pent up frustration of some prominent senators who have made it clear they want answers on what went wrong. It is clear that the information that she gave the american people was incorrect. Reporter: The outrage on capitol hill already cost u.N. Ambassador susan rice a shot at being clinton's replacement as secretary, for saying five days after the attack, it began with s spontaneous protest. Clinton will likely be asked about those statements, but there will be more specifics the committees will want to know. Why wasn't there more security in such a dangerous place? Were you aware there were requests for more security? If not, why not? If so, why were those requests denied? There has already been an investigation at the state department and four employees have been removed from their posts. But it is clinton who the hill committees have long wanted to hear from. But this is not the way clinton wanted to end her tenure and this will be one of her last public appearances as secretary. John kerry's confirmation hearing is scheduled for thursday, diane. All right, martha. But you have news tonight about an exoneration in another story we covered? Reporter: I do. General john allen, who was being investigated for what the pentagon called possibly inappropriate e-mails to socialite jill kelly, has now been cleared of wrongdoing. The e-mails were discovered as part of the investigation into the extramarital affair of cia director david petraeus. So, a lot of news, diane. So, that's over for him, then? Reporter: That is. All right, thank you, martha radda