Honduran migrants wait in line to cross over the border checkpoint into Guatemala in Agua Caliente, Honduras. A new caravan of at least several hundred Hondurans has set off toward the United States on foot or in vehicles. Some have already crossed into Guatemala. Mario Tama/Getty Images hide caption
An employee of Tokyo Electric Power Co. works at Japan's Fukushima Dai-ichi nuclear power plant to decontaminate the area after the 2011 nuclear meltdown. A Vietnamese laborer in Japan on a training program says he was also put to work cleaning up the site, but with inadequate gear. Christopher Furlong/Getty Images hide caption
Migrants walk toward a snow-covered pass to cross the border from Italy to France, in January 2018 near Bardonecchia, Italian Alps. Piero Cruciatti/AFP/Getty Images hide caption
A migrant receives medical attention at a former paper factory in Greece that has been turned into a makeshift camp. Menelaos Michalatos/SOPA Images/LightRocket via Getty Images hide caption
The rescue ship Aquarius, chartered by aid groups SOS Mediterranee and Doctors Without Borders, leaves the harbor of Marseille, France, on Aug. 1. The ship has been docked at Marseille since September, when it lost its registration, and Italian authorities are demanding its seizure. Boris Horvat/AFP/Getty Images hide caption
Members of the 89th Military Police and 541st Engineering Company, 19th Engineering Battalion at Fort Knox, Ky., are briefed upon arrival Wednesday at Lackland Air Force Base, Texas. They are among some 7,000 troops deploying to the U.S.-Mexican border. Senior Airman Alexandra Minor/Department of Defense hide caption
Migrants heading toward the U.S. carry Honduran and Guatemalan national flags in Guatemala on Monday. President Trump has threatened to cut off aid to Honduras, Guatemala and El Salvador for failing to stop the caravan's journey. Orlando Estrada/AFP/Getty Images hide caption
Thousands of migrants attempted to cross the border from Guatemala into Mexico this week. Many of the migrants have reportedly returned to their home countries of Honduras and Guatemala. Oliver de Ros/AP hide caption
The Aquarius rescue ship last month as it entered the harbor of Senglea, Malta. Rene Rossignaud/AP hide caption
A wildfire raged near the Moria refugee camp, pictured here, on Greece's Lesbos Island. The camp is home to an estimated 9,000 migrants and refugees. ARIS MESSINIS/AFP/Getty Images hide caption
An official wearing a protective suit gestures towards migrants as they sit on the deck of the Italian Coast Guard vessel the Ubaldo Diciotti in the Sicilian port of Catania, as they wait to disembark following a rescue operation at sea. GIOVANNI ISOLINO/AFP/Getty Images hide caption
Women grieve as the coffin of one of the 24 migrants who drowned while trying to reach Italy, is buried in Santa Maria Addolorata Cemetery on the outskirts of Valletta, Malta, on April 23, 2015. The migrants died as a smuggler's boat crammed with hundreds of people overturned off the coast of Libya. Alessandra Tarantino/AP hide caption
Migrants wait to disembark from the rescue ship Aquarius in the Sicilian harbor of Catania, Italy, on May 27. This past weekend the ship picked up more migrants, but was turned away from ports in Sicily and the nearby country of Malta. Now it will head for Spain instead. Guglielmo Mangiapane/Reuters hide caption
Deana Quczada of Honduras has been camping with her young children on the street in Tijuana for several days. Going back to the violence in her home country is not an option, she says. Kirk Siegler/NPR hide caption
The Mexican ambassador to the United States, Gerónimo Gutiérrez, speaks at a news conference at the Mexican Embassy in Washington on March 9, 2017. Aaron Bernstein/Reuters hide caption
Rasha al-Ahmad, 25, washes her hands with donated bottled water inside a tent her family put up next to the Moria refugee camp. Her 1-year-old daughter, Tamar, is next to her. "The biggest challenge is keeping myself and my children clean," she says. Joanna Kakissis for NPR hide caption
A poster with billionaire George Soros is pictured in July in Székesfehérvár, Hungary. Attila Kisbenedek/AFP/Getty Images hide caption
African migrants leaving an Israeli government immigration office in Bnei Brak, Israel. Posters in Arabic and Tigrinya on the wall announce Israel's "voluntary departure" policy for Sudanese and Eritrean migrants. Daniel Estrin/NPR hide caption
A crowd waits to cross the border into Colombia over the Simón Bolívar bridge in San Antonio del Táchira, Venezuela, in July 2016. Ariana Cubillos/AP hide caption
Afghan asylum seeker and his 2 1/2-year-old daughter. Soraya Nelson/NPR hide caption
Migrant Justice activists gather to celebrate the signing of an agreement with Ben & Jerry's that took two years to negotiate. Kathleen Masterson/Vermont Public Radio hide caption
Benjamin Raphael of Nigeria (left) is a salesman who had never picked up a paint brush before he found asylum in Italy. Sylvia Poggioli/NPR hide caption