A federal judge ruled late Tuesday that U.S. officials must retain custody and control of migrants apparently removed to South Sudan in case he orders their removals were unlawful.

In another case described in Tuesday’s court filings, lawyers attached an email from the wife of a person with a removal order to Vietnam. Per that account, ICE officials told detainees that they were to be sent to South Africa, before returning to correct themselves and tell the group of their true destination: South Sudan.