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An American couple’s freedom may have come at a steep price: the release of a convicted terrorist from Supermax prison.

Before he was released from a U.S. maximum-security prison last week, a confessed al Qaeda sleeper agent was offered up in a potential prisoner swap that would have freed two Americans held abroad.

The Daily Beast has learned that the proposal was floated in July 2014 to the then-U.S. ambassador in Qatar by an individual acting on behalf of that country’s attorney general. According to two individuals with direct knowledge of the case, the proposition was made shortly after the Obama administration traded five Taliban fighters for Army Sgt. Bowe Bergdahl. Those fighters were also sent to Qatar, where they’re to remain under government watch until later this year. U.S. officials have said they’re at risk of plotting further attacks against the United States.

The proposed swap involving the al Qaeda agent, Ali Saleh Al-Marri, raises troubling questions about whether the Bergdahl trade opened a kind of Pandora’s box, signaling to foreign governments that they can pressure the United States to make concessions on terrorism by trading American prisoners abroad for dangerous extremists held in the United States.

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