In a call with reporters Tuesday morning, DHS officials confirmed they were working on a plan to send migrants who had entered the United States from Mexico back to Mexico, even if they were not citizens of that country.

Buried deep in the Trump administration’s plans to round up undocumented immigrants is a provision certain to enrage Mexico — new authority for federal agents to deport anyone caught crossing the southern border to Mexico, regardless of where they are from.

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Lucas Guttentag, a former DHS adviser and Stanford law professor, said this would “unleash chaos,” violate due process, and meet challenges in court, similar to those that scuttled the administration’s travel ban.