>> reporter: pressed further by earl earl james rosen he clarified the president knew she was using a personal e-mail address but only learned later she was using that server. >> ed henry on the campaign trail, thank you. united airlines is looking for a new boss. ceo jeffrey smizek and two other senior executives have resigned amidst a federal investigation into the possible trading of favors between the airline and the former head of the port authority of new york and new jersey who was appointed by new jersey governor chris christie. that inquiry sprung from the probe into the scandal over the closing of lanes on the george washington bridge two years ago. we asked governor christie about the bridgegate investigation. that's a little later in our program. still ahead, scientists think they may have discovered one of your long lost ancestors in south africa. we'll head there. first, if you thought the hacking of data on government ooñóokñ.??????ó