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.

President Donald Trump asked the Supreme Court on Tuesday to make it easier for his administration to deport people to South Sudan and other countries that are not their homeland, the latest in a series of controversial immigration policies the administration has put before the conservative-majority high court.