President Barack Obama and first lady Michelle Obama greet children and families of U.S. embassy personnel during an event at the Melia Habana Hotel in Havana, Cuba, Sunday. The Associated Press

President Barack Obama and Cuban President Raul Castro walk past military personnel in a welcoming ceremony at the Palace of the Revolution Monday in Havana. The Associated Press

President Barack Obama meets with Cuban President Raul Castro at the Palace of the Revolution, Monday, in Havana, Cuba. The Associated Press

Cuban President Raul Castro, left, holds President Barack Obama's arm during the welcoming ceremony at the Palace of the Revolution, Monday, in Havana, Cuba. The Associated Press

Raul Castro shakes hands with Barack Obama Monday in the Revolution Palace. Brushing past profound differences, Obama and Castro sat down for a meeting, potentially offering clues about whether the shift in American policy will be fully reciprocated by Cuba. The Associated Press

Aided by women translators, Cuban President Raul Castro, center left, speaks with U.S. President Barack Obama during a meeting in Revolution Palace, Monday. The Associated Press

U.S. President Barack Obama with first lady Michelle Obama during a walking tour of Old Havana, Cuba, Sunday. Obama became the first U.S. president to visit the island in nearly 90 years. The Associated Press

Air Force One approaches Havana’s international airport Sunday. President Obama is the first U.S. president to visit Cuba since Calvin Coolidge nearly 90 years ago. The U.S. cut ties with the Communist nation in 1961.

President Barack Obama, second from left, arrives with first lady Michelle Obama, left, and their daughters Sasha, front right, and Malia, as they exit Air Force One at the airport in Havana, Cuba, Sunday. The Associated Press

President Barack Obama, right, shakes hands with Cuba's Foreign Minister Bruno Rodriguez as first lady Michelle Obama stands behind, right, upon arrival to the airport in Havana, Cuba, Sunday. The Associated Press

A Cuban man carrying the Stars and Stripes waits in the rain to wave to U.S. President Barack Obama's convoy as it arrives along the Malecon into Old Havana, Cuba, Sunday. The Associated Press

U.S. President Barack Obama, center, waves to people in a nearby crowd during a walking tour of Old Havana, Sunday in Havana, Cuba.

Tourists stand next to a sign showing President Barack Obama, right, and Cuba's President Raul Castro next to the Cathedral in Old Havana, Cuba, Sunday ahead of Obama's arrival. The Associated Press

People climb a window grate as it rains in hopes of catching a glimpse of President Barack Obama during his visit to Cathedral Square in Old Havana, Cuba, Sunday. The Associated Press

President Barack Obama and his daughter Malia smile as the visit a monument of Cuban independence hero Carlos Manuel de Cespedes during their visit to Old Havana, Cuba, Sunday. The Associated Press

Cuban security officials form a human barricade to keep locals a safe distance away U.S. President Barack Obama's walking tour of Old Havana with members of his family, Sunday in Havana, Cuba. The Associated Press

This Tuesday, March 15, 2016 image shows a framed image of revolutionary hero Ernesto "Che" Guevara adorning a room across the doorway from a Stars and Stripes tacked to a wall, in the home of actor Armando Ricart, a former boxer and carpenter, in Havana, Cuba. The Associated Press

Local Cubans watch from their homes as the motorcade of U.S. President Barack Obama arrives in a section of Old Havana, Sunday in Havana, Cuba. The Associated Press