Migrants rest as they join a caravan heading to Mexico City, in Huixtla, Mexico October 26, 2021.

Migrants, from Haiti, South America and Central America rest in Huixtla before continuing in a caravan headed for Mexico City to apply for asylum and refugee status, in Huixtla, Mexico October 26, 2021.

Migrants wash clothes in a river before continuing their journey walking in a caravan of migrants from Central America and Haiti heading Mexico City to apply for asylum and refugee status, in Huixtla, Mexico October 26, 2021.

Migrants from Central America and Haiti walk on a road in a caravan heading to Mexico City?to apply for asylum and refugee status, in Huehuetan, Mexico October 25, 2021.

Migrants rest as they join a caravan heading to Mexico City, in Huixtla, Mexico October 26, 2021.

Migrants from Central America and Haiti rest as they join a caravan heading to Mexico City, in Huixtla, Mexico October 26, 2021. Image for illustrative purposes.

A migrant bathes in a river before continuing the journey walking in a caravan of migrants from Central America and Haiti heading Mexico City to apply for asylum and refugee status, in Huixtla, Mexico October 26, 2021.

A migrant shaves while he bathes in a river before continuing the journey walking in a caravan of migrants from Central America and Haiti heading Mexico City to apply for asylum and refugee status, in Huixtla, Mexico October 26, 2021.

Men walk as migrants put clothes to dry before continuing their journey walking in a caravan of migrants from Central America and Haiti heading to Mexico City to apply for asylum and refugee status, in Huixtla, Mexico October 26, 2021.

Migrants put clothes to dry before continuing their journey walking in a caravan of migrants from Central America and Haiti heading to Mexico City to apply for asylum and refugee status, in Huixtla, Mexico October 26, 2021.

Migrants wash clothes in a river before continuing their journey walking in a caravan of migrants from Central America and Haiti heading Mexico City to apply for asylum and refugee status, in Huixtla, Mexico October 26, 2021. REUTERS/Daniel Becerril

Migrants rest before continuing their journey walking in a caravan of migrants from Central America and Haiti heading to Mexico City to apply for asylum and refugee status, in Huixtla, Mexico October 26, 2021.

Migrants rest before continuing their journey walking in a caravan of migrants from Central America and Haiti heading to Mexico City to apply for asylum and refugee status, in Huixtla, Mexico October 26, 2021.

Migrants rest as they join a caravan heading to Mexico City, in Huixtla, Mexico October 26, 2021.

Migrants wash clothes in a river before continuing their journey walking in a caravan of migrants from Central America and Haiti heading Mexico City to apply for asylum and refugee status, in Huixtla, Mexico October 26, 2021.

A woman walks with a child as migrants from Central America and Haiti join a caravan heading to Mexico City, in Huixtla, Mexico October 26, 2021.

Migrants, from Haiti, South America and Central America rest in Huixtla before continuing in a caravan headed for Mexico City to apply for asylum and refugee status, in Huixtla, Mexico October 26, 2021.

Migrants, from Haiti, South America and Central America rest in Huixtla before continuing in a caravan headed for Mexico City to apply for asylum and refugee status, in Huixtla, Mexico October 26, 2021.

Migrants rest before continuing their journey walking in a caravan of migrants from Central America and Haiti heading to Mexico City to apply for asylum and refugee status, in Huixtla, Mexico October 26, 2021.