Amna Nawaz:

Abu Zubaydah was the first high-value detainee subjected to the CIA's program of enhanced interrogation techniques, practices denounced as torture both here in the U.S. and around the world.

After being captured in a firefight in Pakistan in 2002, Zubaydah was shuttled among so-called black sites, secret prisons run by the CIA all over the world. He has never been charged with a crime, but for the past 20 years has remained imprisoned, mostly at Guantanamo Bay, while a team of lawyers fights for his release.

A new documentary called "The Forever Prisoner" explores the story of Abu Zubaydah and U.S. actions in the name of national security.

The filmmaker behind it is Academy Award-winner Alex Gibney. And he joins me now.

Welcome to the "NewsHour." Thanks for being here.

Alex Gibney, Filmmaker, "The Forever Prisoner": Thanks. Glad to be here.

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