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President Barack Obama, left, listens to a live band along with Cuba’s President Raul Castro during a state dinner at the Palace of the Revolution in Havana, Cuba, Monday, March 21, 2016. Laying bare a half-century of tensions, Obama and Castro prodded each other Monday over human rights and the long-standing U.S. economic embargo during an joint news conference. (AP Photo/Rebecca Blackwell)

President Barack Obama, left, listens to a live band along with Cuba's President Raul Castro during a state dinner at the Palace of the Revolution in Havana, Cuba, Monday, March 21, 2016. Laying bare a half-century of tensions, Obama and Castro prodded each other Monday over human rights and the long-standing U.S. economic embargo during an joint news conference. (AP Photo/Rebecca Blackwell)