In letter, 'American Taliban' John Walker Lindh said ISIS 'doing a spectacular job'

One expert said Lindh would be wise to clarify his views about ISIS.

"John Walker Lindh served his time. Given the support for ISIS expressed in this letter from four years ago, it would be important for Lindh to go on record declaring his intentions to live a peaceful and constructive life and to renounce terrorism and violence," said Karen Greenberg, director of Fordham University’s Center on National Security. "Without that, allegations, confusion and anger will likely continue to surround him."

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