El Salvador's government has confirmed to UN investigators that the U.S. government, under the Trump administration, retains control over migrants deported from the U.S. to a Salvadoran prison. This arrangement raises significant human rights concerns regarding the extent of U.S. authority within a foreign nation's penal system and the potential for abuse or exploitation of the deported individuals. The details of this unusual agreement are still emerging, and further investigation is expected from international bodies.