Cuban President Raul Castro, left, shakes hands with U.S. President Barack Obama during a meeting in Revolution Palace, Monday, March 21, 2016. Brushing past profound differences, President Obama and President Castro sat down for a historic meeting, offering critical clues about whether Obama’s sharp U-turn in policy will be fully reciprocated. (AP Photo/Ramon Espinosa)

Aided by women translators, Cuban President Raul Castro, center left, speaks with U.S. President Barack Obama during a meeting in Revolution Palace, Monday, March 21, 2016. Brushing past profound differences, President Obama and President Castro sat down for a historic meeting, offering critical clues about whether Obama’s sharp U-turn in policy will be fully reciprocated. (AP Photo/Ramon Espinosa)

President Barack Obama and Cuban President Raul Castro shake hands at the conclusion of their joint news conference at the Palace of the Revolution, Monday, March 21, 2016 in Havana, Cuba. (AP Photo/Pablo Martinez Monsivais)

President Barack Obama and Cuban President Raul Castro hold hands on stage at the conclusion of their joint news conference at the Palace of the Revolution, Monday, March 21, 2016 in Havana, Cuba. (AP Photo/Pablo Martinez Monsivais)

U.S. President Barack Obama, left, speaks next to Cuba’s President Raul Castro, during a joint statement in Havana, Cuba, Monday, March 21, 2016. President Raul Castro called on President Obama to lift longstanding U.S. restrictions on Cuba, even as he and Obama pledged to move forward with normalizing relations between Cuba and its longtime Cold War-era foe. (AP Photo/Ramon Espinosa)