In this photo reviewed by U.S. military officials, flags fly in front of the tents of Camp Justice in Guantanamo Bay Naval Base, Cuba, on April 18, 2019. For the first time since the facility in Cuba opened in 2002, a U.S. president had allowed a United Nations independent investigator, Fionnuala Ní Aoláin, to visit. (AP Photo/Alex Brandon, File)