The 20th anniversary of the Iraq War this week reminds us of the critical importance of holding governments to account. Whistleblowing plays a crucial role in this pursuit. Daniel Ellsberg is probably the patron saint of modern-day whistleblowers thanks to one giant leap of courage and conscience. Leaking the Pentagon Papers in 1971, at great personal risk, changed the course of history, and revealed America secretly knew the war was unwinnable. 50 years later, Ellsberg is still deeply committed to peace and transparency, but this month – at almost 92 – he revealed his latest personal battle, after being diagnosed with inoperable pancreatic cancer. He speaks with Christiane from his home in California to discuss his life, this farewell moment, and how to save lives by speaking out. Also on today's show: Musician Yusuf/Cat Stevens; Eric Schmidt, former CEO & chairman of Google To learn more about how CNN protects listener privacy, visit cnn.com/privacy