PHOTO: 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, March 20, 2016.Pablo Martinez Monsivais/AP Photo

PHOTO: President Barack Obama waves to journalists next to a painting of President Abraham Lincoln at Havanas City Museum during a visit to Old Havana, Cuba, Sunday, March 20, 2016.Ramon Espinosa/AP Photo
President Barack Obama waves to journalists next to a painting of President Abraham Lincoln at Havana's City Museum during a visit to Old Havana, Cuba, Sunday, March 20, 2016.