and so many others. >> reporter: as he long threatened, trump rehashed old clinton controversies. bringing to the debate three women who accused bill clinton of sexual misconduct in the 1990s. >> if you look at bill clinton, far worse. mine are words, his were action. >> i am reminded of what my friend, michelle obama, reminded us all. when they go low, you go high. >> reporter: trump in an extraordinary remark threatening to jail clinton if he becomes president over her handling of classified material on her private e-mail server as secretary of state. >> if i win, i am going to instruct my attorney general to get a special prosecutor to look into your situation. >> it's just awfully good that someone with the temperament of donald trump is not in charge of the law in our country. >> because you'd be in jail. >> reporter: trump frequently interrupting clinton throughout the heated exchange.