Condemned inmates are seen in the north segregation section of death row at San Quentin State Prison Tuesday, Aug. 16, 2016, in San Quentin, California
US President Barack Obama, alongside Charles Samuels (R), Bureau of Prisons Director, and Ronald Warlick (L), a correctional officer, looks at a prison cell as he tours a cell block at the El Reno Federal Correctional Institution in El Reno, Oklahoma, Jul