United States began mass unwritten third-country deportations to Mexico under Trump
Beginning January 20, 2025, the second Trump administration dramatically expanded a decades-old, never-written practice of deporting third-country nationals to Mexico, sending almost 13,000 people there by March 2026 — by far the largest volume under the program. A March 2026 Justice Department court filing referred to a "standing (unwritten) agreement" with Mexico; neither government has ever published its terms.
