FILE - In this April 17, 2014, file photo, President Barack Obama speaks at the White House in Washington. Obama says the botched execution of an Oklahoma inmate highlights significant problems with the death penalty, and he's asking the attorney general for a review. Obama says he found inmate Clayton Lockett's execution on April 29 "deeply troubling." Lockett convulsed violently during the execution and tried to lift his head after a doctor declared him unconscious. He later died of an apparent heart attack. (AP Photo/J. Scott Applewhite, File)
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