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8-1978, AUG 9 1978 Daniel Ellsberg (Activist) - Groups Credit: Denver Post (Denver Post via Getty Images)

8-1978, AUG 9 1978 Daniel Ellsberg (Activist) - Groups Credit: Denver Post  (Denver Post via Getty Images)

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FORT MEADE, MD - JUNE 1: Daniel Ellsberg, former United States military analyst considered the Pentagon Papers whistleblower, speaks during mass rally in support for PFC Bradley Manning on June 1, 2013 in Fort Meade, Maryland. Manning's court martial is set to begin Monday June 3, 2013. Hundreds of supporters marched in support of Manning for giving classified documents to the anti-secrecy groups WikiLeaks. (Photo by Lexey Swall/Getty Images)

FORT MEADE, MD - JUNE 1: Daniel Ellsberg, former United States military analyst considered the Pentagon Papers whistleblower, speaks during mass rally in support for PFC Bradley Manning on June 1, 2013 in Fort Meade, Maryland. Manning's court martial is set to begin Monday June 3, 2013. Hundreds of supporters marched in support of Manning for giving classified documents to the anti-secrecy groups WikiLeaks.  (Photo by Lexey Swall/Getty Images)

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BEVERLY HILLS, CA - NOVEMBER 16: John Kiriakou (L) and Daniel Ellsberg arrive for PEN Center USA's 25th Annual Literary Awards Festival at the Beverly Wilshire Four Seasons Hotel on November 16, 2015 in Beverly Hills, California. (Photo by Gabriel Olsen/FilmMagic)

BEVERLY HILLS, CA - NOVEMBER 16:  John Kiriakou (L) and Daniel Ellsberg arrive for PEN Center USA's 25th Annual Literary Awards Festival at the Beverly Wilshire Four Seasons Hotel on November 16, 2015 in Beverly Hills, California.  (Photo by Gabriel Olsen/FilmMagic)

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American author Daniel Ellsberg, publisher of 'The Pentagon Papers,' speaks at a press conference, 1970s. (Photo by Pictorial Parade/Getty Images)

American author Daniel Ellsberg, publisher of 'The Pentagon Papers,' speaks at a press conference, 1970s. (Photo by Pictorial Parade/Getty Images)

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8-1978, AUG 2 1978 Daniel Ellsberg (Activist) - Ind. Credit: Denver Post, Inc. (Denver Post via Getty Images)

8-1978, AUG 2 1978 Daniel Ellsberg (Activist) - Ind. Credit: Denver Post, Inc.  (Denver Post via Getty Images)