In this Jan. 17, 2016, file photo, President Obama speaks about the release of Americans by Iran, in the Cabinet Room of the White House in Washington. A $400 million cash delivery to Iran to repay a decades-old arbitration claim may be unprecedented in recent U.S. history, according to legal experts and diplomatic historians, raising further questions about a payment timed to help free four American prisoners in Iran. (AP Photo/Jacquelyn Martin, File)
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