Eight men sent by the United States to South Sudan could presage a new approach to Trump-era deportations, even as critics say the practice could amount to “enforced disappearance.”

The migrants were the subject of a lawsuit that halted their deportation to South Sudan and diverted them to a U.S. military base in Djibouti.

A federal judge in Boston rejected a final plea Friday from the immigrants’ lawyers, saying the Supreme Court authorized the transfers.