Brennan strikes back at scathing CIA interrogation report

In a rare news conference, CIA Director John Brennan defended the agency’s record on so-called enhanced interrogation techniques and conceded abuses. While Brennan said that in some cases harsh tactics led to or confirmed important information, he admitted the cause-and-effect “is unknown and unknowable.” Gwen Ifill learns more from Siobhan Gorman of The Wall Street Journal.