In the waning hours of his presidency, Barack Obama used his clemency power to commute the prison sentence of Chelsea Manning, a former U.S. Army analyst who was convicted of espionage in July 2013 by a military court after she turned over a massive cache of defense and diplomatic records, then the largest single leak in U.S. history, to the organization WikiLeaks. Among the materials released by Manning was a video recording showing Iraqi civilians being killed in a U.S. helicopter attack in Baghdad in 2007.

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