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US President Barack Obama visits the cell where Nelson Mandela, an anti-apartheid activist, was once jailed on Robben Island, on June 30, 2013. Paying homage to the 94-year-old former South-African president, who is critically ill in hospital, Obama stared into the stark cell where Mandela spent two thirds of his 27 years in jail.  AFP PHOTO/JIM  WATSON        (Photo credit should read JIM WATSON/AFP/Getty Images)
US President Barack Obama visits the cell where Nelson Mandela, an anti-apartheid activist, was once jailed on Robben Island, on June 30, 2013. Paying homage to the 94-year-old former South-African president, who is critically ill in hospital, Obama stared into the stark cell where Mandela spent two thirds of his 27 years in jail.  AFP PHOTO/JIM  WATSON        (Photo credit should read JIM WATSON/AFP/Getty Images)

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Obama's push for criminal justice reform

President Obama announces new measures aimed at helping former prisoners build new lives. CNN's Jim Acosta reports.

Obama's push for criminal justice reform

President Obama announces new measures aimed at helping former prisoners build new lives. CNN's Jim Acosta reports.