Migrant caravan: Scenes from the 2,000-mile journey thousands are making to get to the U.S. border Members of the migrant caravan push forward at a gate separating Guatemala from Mexico on October 19, 2018 in Ciudad Tecun Uman, Guatemala. The caravan of thousands of immigrants, most from Honduras, pushed open the gate on the Guatemalan side and crossed the bridge to Mexico but were then pushed back by Mexican riot police.Photo by: John Moore Migrant caravan: Scenes from the 2,000-mile journey thousands are making to get to the U.S. border A caravan of more than 1,500 Honduran migrants moves north after crossing the border from Honduras into Guatemala on October 15, 2018 in Esquipulas, Guatemala. The caravan, the second of 2018, began Friday in San Pedro Sula, Honduras with plans to march north through Guatemala and Mexico en route to the United States. Honduras has some of the highest crime and poverty rates in Latin America. Photo by: John Moore Migrant caravan: Scenes from the 2,000-mile journey thousands are making to get to the U.S. border Guatemalan Red Cross medics treat members of a migrant caravan on October 16, 2018 near Quezaltepeque, Guatemala. The caravan of more than 1,500 people, the second of its size in 2018, began last week in San Pedro Sula, Honduras with plans to march north through Guatemala and Mexico in route to the United States. Photo by: John Moore Migrant caravan: Scenes from the 2,000-mile journey thousands are making to get to the U.S. border Members of the migrant caravan run from tear gas fired by Mexican riot police on the border between Mexico and Guatemala on October 19, 2018 in Ciudad Tecun Uman, Guatemala. The clash occurred when the caravan of thousands of migrants tried to enter Mexico, crossing over the international bridge after pushing past Guatemalan security forces. The caravan pried open the gate into Mexico but was pushed back by Mexican riot police. Some immigrants threw stones at police who then fired tear gas into the crowd.Photo by: John Moore Migrant caravan: Scenes from the 2,000-mile journey thousands are making to get to the U.S. border A member of the migrant caravan watches as a fellow immigrant is searched by Guatemalan police at a highway checkpoint en route to the border with Mexico on October 18, 2018 in Palin, Guatemala. The immigrants were part of a migrant caravan of thousands of Central Americans, mostly from Honduras, hoping to eventually reach the United States. U.S. President Donald Trump has threatened to cancel the recent trade deal with Mexico and withhold aid to Central American countries if the caravan isn't stopped before reaching the U.S. Photo by: John Moore Migrant caravan: Scenes from the 2,000-mile journey thousands are making to get to the U.S. border People in a migrant caravan make their way towards the Guatemalan border with Mexico on October 18, 2018 in Siquinala, Guatemala. The immigrants were part of a migrant caravan of thousands of Central Americans, most from Honduras, hoping to eventually reach the United States. U.S. President Donald Trump has threatened to cancel the recent trade deal with Mexico and withhold aid to Central American countries if the caravan isn't stopped before reaching the U.S. Photo by: John Moore Migrant caravan: Scenes from the 2,000-mile journey thousands are making to get to the U.S. border A child takes cover as Mexican riot police clash with the migrant caravan on the border of Mexico and Guatemala on October 19, 2018 in Ciudad Tecun Uman, Guatemala. The clash occurred when the caravan of thousands tried to enter Mexico, crossing over the international bridge after pushing past Guatemalan security forces. The caravan opened the gate into Mexico but was pushed back by Mexican riot police. Some immigrants threw stones at the police who then fired tear gas into the crowd. Photo by: John Moore Migrant caravan: Scenes from the 2,000-mile journey thousands are making to get to the U.S. border A member of the migrant caravan collapses following a clash with Mexican riot police on the border between Mexico and Guatemala on October 19, 2018 in Ciudad Tecun Uman, Guatemala. The clash occurred when the caravan of thousands of migrants tried to enter Mexico, crossing over the international bridge after pushing past Guatemalan security forces. The caravan pried open the gate into Mexico but was pushed back by Mexican riot police. Some immigrants threw stones at police who then fired tear gas into the crowd. Photo by: John Moore Migrant caravan: Scenes from the 2,000-mile journey thousands are making to get to the U.S. border Members of the migrant caravan are overcome by tear gas fired by Mexican riot police on the border between Mexico and Guatemala on October 19, 2018 in Ciudad Tecun Uman, Guatemala. The clash occurred when the caravan of thousands of migrants tried to enter Mexico, crossing over the international bridge after pushing past Guatemalan security forces. The caravan pried open the gate into Mexico but was pushed back by Mexican riot police. Some immigrants threw stones at police who then fired tear gas into the crowd.Photo by: John Moore Migrant caravan: Scenes from the 2,000-mile journey thousands are making to get to the U.S. border Members of the migrant caravan rush onto the bridge between Guatemala and Mexico after pushing past Guatemalan police a on October 19, 2018 in Ciudad Tecun Uman, Guatemala. The caravan of thousands of immigrants, mostly from Honduras, crossed the bridge and pried open the gate into Mexico but were pushed back by Mexican riot police. Photo by: John Moore Migrant caravan: Scenes from the 2,000-mile journey thousands are making to get to the U.S. border A young member of the immigrant caravan cries as her family is pushed forward at a gate separating Guatemala from Mexico on October 19, 2018 in Ciudad Tecun Uman, Guatemala. The caravan of thousands of immigrants, most from Honduras, pushed open the gate on the Guatemalan side and crossed the bridge to Mexico but were forced back by Mexican riot police.Photo by: John Moore Migrant caravan: Scenes from the 2,000-mile journey thousands are making to get to the U.S. border A Mexican riot policeman protects an immigrant father and child during a clash between police and the migrant caravan on the border between Mexico and Guatemala on October 19, 2018 in Ciudad Tecun Uman, Guatemala. A faceoff occurred when the caravan of thousands of migrants tried to enter Mexico after pushing past Guatemalan security forces. The caravan pried open the gate into Mexico but were pushed back by Mexican riot police. Some immigrants threw stones at police who then fired tear gas into the crowd.Photo by: John Moore Migrant caravan: Scenes from the 2,000-mile journey thousands are making to get to the U.S. border Immigrant family members are overcome with tear gas during a clash between police and the migrant caravan on the border between Mexico and Guatemala on October 19, 2018 in Ciudad Tecun Uman, Guatemala. A faceoff occurred when the caravan of thousands of migrants tried to enter Mexico after pushing past Guatemalan security forces. The caravan pried open the gate into Mexico but were pushed back by Mexican riot police. Some immigrants threw stones at police who then fired tear gas into the crowd. Photo by: John Moore Migrant caravan: Scenes from the 2,000-mile journey thousands are making to get to the U.S. border Members of the migrant caravan clash with Mexican riot police at the border between Mexico and Guatemala on October 19, 2018 in Ciudad Tecun Uman, Guatemala. Migrants and Mexican police faced off when the caravan of thousands of migrants tried to cross into Mexico after pushing past Guatemalan security forces. Photo by: John Moore Migrant caravan: Scenes from the 2,000-mile journey thousands are making to get to the U.S. border Members of the migrant caravan retreat during a clash with Mexican riot police on the border between Mexico and Guatemala on October 19, 2018 in Ciudad Tecun Uman, Guatemala. The faceoff occurred when the caravan of thousands of migrants tried to enter Mexico after pushing past Guatemalan security forces. Photo by: John Moore Migrant caravan: Scenes from the 2,000-mile journey thousands are making to get to the U.S. border Children in the migrant caravan are lifted over a gate at the Guatemala-Mexico border on October 19, 2018 in Ciudad Tecun Uman, Guatemala. The caravan of thousands of immigrants, most from Honduras, pushed past Guatemalan police before clashing with Mexican riot police. Photo by: John Moore Migrant caravan: Scenes from the 2,000-mile journey thousands are making to get to the U.S. border Family members in the migrant caravan are pushed forward during a chaotic scene at a gate separating Guatemala from Mexico on October 19, 2018 in Ciudad Tecun Uman, Guatemala. The caravan of thousands of immigrants, most from Honduras, pushed open the gate on the Guatemalan side and crossed the bridge to Mexico but were then pushed back by Mexican riot police. Photo by: John Moore Migrant caravan: Scenes from the 2,000-mile journey thousands are making to get to the U.S. border A Mexican riot policeman protects an immigrant father and child during a clash between police and the migrant caravan on the border between Mexico and Guatemala on October 19, 2018 in Ciudad Tecun Uman, Guatemala. A faceoff occurred when the caravan of thousands of migrants tried to enter Mexico after pushing past Guatemalan security forces. Photo by: John Moore Migrant caravan: Scenes from the 2,000-mile journey thousands are making to get to the U.S. border Members of the migrant caravan climb over a gate separating Guatemala from Mexico on October 19, 2018 in Ciudad Tecun Uman, Guatemala. The caravan of thousands of immigrants, most from Honduras, pushed open the gate on the Guatemalan side and crossed the bridge to Mexico but were then pushed back by Mexican riot police. Photo by: John Moore Migrant caravan: Scenes from the 2,000-mile journey thousands are making to get to the U.S. border Immigrants wade through the Suchiate River while crossing the border from Guatemala into Mexico on October 20, 2018 at Ciudad Hidalgo, Mexico. The caravan of thousands of Central Americans, mostly from Honduras, hopes to eventually reach the United States. U.S. President Donald Trump has threatened to cancel the recent trade deal with Mexico and withhold aid to Central American countries if the caravan isn't stopped. Photo by: John Moore Migrant caravan: Scenes from the 2,000-mile journey thousands are making to get to the U.S. border A family in the migrant caravan waits at a gate separating Guatemala from Mexico on October 19, 2018 in Ciudad Tecun Uman, Guatemala. The caravan of thousands of immigrants, most from Honduras, pushed open the gate on the Guatemalan side and crossed the bridge to Mexico but were then pushed back by Mexican riot police. Photo by: John Moore Migrant caravan: Scenes from the 2,000-mile journey thousands are making to get to the U.S. border An immigrant waits to get into a shelter for the night after crossing the border from Guatemala into Mexico on October 20, 2018 at Ciudad Hidalgo, Mexico. The caravan of thousands of Central Americans, mostly from Honduras, hopes to eventually reach the United States. U.S. President Donald Trump has threatened to cancel the recent trade deal with Mexico and withhold aid to Central American countries if the caravan isn't stopped. Photo by: John Moore Migrant caravan: Scenes from the 2,000-mile journey thousands are making to get to the U.S. border An immigrant is pulled from the current of the Suchiate River while crossing the border from Guatemala into Mexico on October 20, 2018 at Ciudad Hidalgo, Mexico. The caravan of thousands of Central Americans, mostly from Honduras, hopes to eventually reach the United States. U.S. President Donald Trump has threatened to cancel the recent trade deal with Mexico and withhold aid to Central American countries if the caravan isn't stopped. Photo by: John Moore Migrant caravan: Scenes from the 2,000-mile journey thousands are making to get to the U.S. border An immigrant jumps off a bridge to enter Mexico from the border with Guatemala as part of the immigrant caravan on October 20, 2018 in Ciudad Hidalgo, Mexico. The caravan of thousands of Central Americans, mostly from Honduras, hopes to eventually reach the United States. U.S. President Donald Trump has threatened to cancel the recent trade deal with Mexico and withhold aid to Central American countries if the caravan isn't stopped before reaching the U.S. Photo by: John Moore Migrant caravan: Scenes from the 2,000-mile journey thousands are making to get to the U.S. border Members of a migrant caravan walk into the interior of Mexico after crossing the Guatemalan border on October 21, 2018 near Ciudad Hidalgo, Mexico The caravan of Central Americans plans to eventually reach the United States. U.S. President Donald Trump has threatened to cancel the recent trade deal with Mexico and withhold aid to Central American countries if the caravan isn't stopped before reaching the U.S. Photo by: John Moore Migrant caravan: Scenes from the 2,000-mile journey thousands are making to get to the U.S. border Immigrants wade across the Suchiate River while crossing the border from Guatemala into Mexico as part of the immigrant caravan on October 20, 2018 in Ciudad Hidalgo, Mexico. The caravan of thousands of Central Americans, mostly from Honduras, hopes to eventually reach the United States. U.S. President Donald Trump has threatened to cancel the recent trade deal with Mexico and withhold aid to Central American countries if the caravan isn't stopped before reaching the U.S. Photo by: John Moore Migrant caravan: Scenes from the 2,000-mile journey thousands are making to get to the U.S. border Immigrants wade across the Suchiate River while crossing the border from Guatemala into Mexico as part of the immigrant caravan on October 20, 2018 in Ciudad Hidalgo, Mexico. The caravan of thousands of Central Americans, mostly from Honduras, hopes to eventually reach the United States. U.S. President Donald Trump has threatened to cancel the recent trade deal with Mexico and withhold aid to Central American countries if the caravan isn't stopped before reaching the U.S. Photo by: John Moore Migrant caravan: Scenes from the 2,000-mile journey thousands are making to get to the U.S. border A migrant caravan, which has grown into the thousands, walks into the interior of Mexico after crossing the Guatemalan border on October 21, 2018 near Ciudad Hidalgo, Mexico The caravan of Central Americans plans to eventually reach the United States. U.S. President Donald Trump has threatened to cancel the recent trade deal with Mexico and withhold aid to Central American countries if the caravan isn't stopped before reaching the U.S. Photo by: John Moore Migrant caravan: Scenes from the 2,000-mile journey thousands are making to get to the U.S. border Migrants on the Guatemalan side of the border sleep in a public park on October 21, 2018 in Tecun Uman, Guatemala. The caravan of thousands of Central Americans crossed into Mexico with hopes to eventually reach the United States. U.S. President Donald Trump has threatened to cancel the recent trade deal with Mexico and withhold aid to Central American countries if the caravan isn't stopped before reaching the U.S. Photo by: John Moore