The United States is being asked to explain why it appears to be deporting migrants from as far away as Vietnam and Cuba to South Sudan, a chaotic country that's once again in danger of collapsing into civil war.

The foreign men convicted of crimes who were placed on a deportation flight headed for the chaotic nation of South Sudan were originally from countries as far away as Mexico and Vietnam. They had lived in various places from California to Iowa, Nebraska to Florida, with one serving a sentence of nearly 30 years.