PBS Newshour: Disavowing GM decisions of the past, CEO Barra offers apology and further investigation

Senior lawmakers made clear they want answers for why General Motors took years to fix vehicles with faulty ignition switches, linked to at least 13 deaths. GM CEO Mary Barra acknowledged the company's recalls came too late for some and vowed to get to the bottom of the cause. Gwen Ifill talks to David Shepardson of the Detroit News and Joan Claybrook, former president of Public Citizen.