Remembering The Mission To Intercept Flight 93 On 9/11; The Post-9/11 'Forever War'

After the attacks on the World Trade towers and the Pentagon on Sept. 11, 2001, Lt. Gen. Marc Sasseville and his colleagues at the National Guard learned of a fourth hijacked plane — Flight 93 — still in progress. That's when they sprung into action. Sasseville joins us. And, we speak with investigative journalist Spencer Ackerman about his new book, "Reign of Terror: How the 9/11 Era Destabilized America and Produced Trump."