Cuban migrants cross the Suchiate river on rafts from Tecun Uman, in Guatemala, to Ciudad Hidalgo, as seen from Ciudad Hidalgo, Mexico, May 12, 2019. REUTERS/Andres Martinez Casares 

A Cuban migrant looks through the gate as she stays inside Siglo XXI migration facility before a breakout in Tapachula, Mexico, May 12, 2019.

REUTERS/Andres Martinez Casares 

Cuban migrants run away from Siglo XXI migration facility in Tapachula, Mexico, May 12, 2019. REUTERS/Andres Martinez Casares 

A Cuban migrant passes over a fence as she runs away from Siglo XXI migration facility in Tapachula, Mexico, May 12, 2019. REUTERS/Andres Martinez Casares 

Cuban migrants stay inside Siglo XXI migration facility before a breakout in Tapachula, Mexico, May 12, 2019. REUTERS/Andres Martinez Casares 

Cuban migrants are seen in a bus arriving at the airport of Tapachula, Mexico, May 9, 2019. REUTERS/Andres Martinez Casares 

Mexican security forces and migration workers escort Cuban migrants boarding a Mexican Federal Police plane at the airport of Tapachula, Mexico, May 9, 2019. REUTERS/Andres Martinez Casares 

Cuban migrants are seen on a bus outside of Siglo XXI migration facility in Tapachula, Mexico, May 9, 2019. REUTERS/Andres Martinez Casares 

A man looks at a Mexican Federal Police plane as Cuban migrants are deported, in the airport of Tapachula, Mexico, May 9, 2019. REUTERS/Andres Martinez Casares 

Relatives of Cuban migrants cry outside of the Siglo XXI migration facility in Tapachula, Mexico, May 9, 2019. REUTERS/Andres Martinez Casares 

Cuban migrants stand along a road after their buses were seized by Mexican authorities as they participate in the Migrant Via Crucis to continue in their journey towards the United States, in Huixtla, Mexico April 17, 2019. REUTERS/Jose Cabezas 

A Cuban migrant rest as he arrives to a sports center as he walked with other Central American migrants during their journey towards the United States, in Escuintla, Mexico April 18, 2019. REUTERS/Jose Cabezas 

A Mexican Immigration Institute (INM) officer argues with a Cuban migrant after their buses were seized by authorities as they participate in the Migrant Via Crucis to continue in their journey towards the United States, in Huixtla, Mexico April 17, 2019. REUTERS/Jose Cabezas 

Cuban migrants board buses to participate in the Migrant Via Crucis to continue in their journey towards the United States, in Tapachula, Mexico April 17, 2019. REUTERS/Jose Cabezas 

A Cuban migrant helps a woman to carry her daughter as they walk along a highway on their journey towards the United States, in Pijijiapan, Mexico April 22, 2019. REUTERS/Jose Cabezas 

Cubans talk to officials of the National Immigration Institute (INM) to register and get a turn to apply for U.S. asylum, at the premises of the state migrant assistance office in Ciudad Juarez, Mexico April 17, 2019. REUTERS/Jose Luis Gonzalez 

A Cuban shows his turn to apply for U.S. asylum, at the premises of the state migrant assistance office in Ciudad Juarez, Mexico April 17, 2019. REUTERS/Jose Luis Gonzalez 

Cuban migrants participate in a meeting to plan to cross the country on their way to the United States, in Tapachula, Chiapas state, Mexico April 11, 2019. REUTERS/Jose Cabezas 

Cuban migrants rest in their tent at an improvised shelter while waiting for humanitarian visas to enter the United States, in Mapastepec, Chiapas state, Mexico April 10, 2019. REUTERS/Jose Cabezas 

Cuban migrants walk at an improvised shelter while waiting for a humanitarian visa to cross the country on their way to the United States, in Mapastepec, Chiapas state, Mexico April 10, 2019. REUTERS/Jose Cabezas