So-called 'American Taliban' member released after serving 17-year sentence

The family of Mike Spann, a CIA officer who interrogated John Walker Lindh and then was killed by militants, appealed to President Trump, expressing concern about the release.
1:58 | 05/24/19

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Transcript for So-called 'American Taliban' member released after serving 17-year sentence
Next, the man known as the American Taliban has been set free tonight. John walker lindh was today released from prison on good behavior, after his arrest after 9/11 in Afghanistan, serving 17 years for supporting the Taliban. He'd actually spent time in an Al Qaeda training camp. Tonight, some authorities warn he still has terrorist sympathies. He will live in the U.S. ABC's whit Johnson has new reporting on where. Reporter: The so-called American Taliban, John walker lindh, slipping out of this Indiana prison before dawn. He's an American citizen, right? Yeah. Well, right now, you are a prisoner. All right. Reporter: The californian who converted to Islam, captured in 9/11, today released after serving only 17 of his 20-year sentence. President trump saying he wanted to stop it, but legally couldn't. What bothers me more than anything else is that here's a man who has not given up his proclamation of terror. And we have to let him out. Am I happy about it? Not even a little bit. Reporter: Controversy growing after government reports found that lindh "Continued to advocate for global jihad" and "Made pro-isis statements" behind bars. The family of Mike Spann, a CIA officer who interrogated lindh just before he was killed by militants, appealed directly to president trump, expressing concern. It's even more shocking now that we know he's just only continued his radical ideas and ideologies and thoughts while in prison. Reporter: Lindh was released on probation for good behavior, with restrictions on internet access, travel and requiring mental health treatment. David, experts tell us that about 80 convicted terrorists will be released from prison in the next five years, and officials worry about how those individuals will be rehabilitated. As for lindh, we're told he's on the move to his new home in Virginia, outside Washington. David? Whit Johnson on this story from Indiana again tonight. Thank you, whit.

This transcript has been automatically generated and may not be 100% accurate.

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