Mexico Decoded

Mexico Decoded

How Trump’s Deportation Machine Actually Works

The most complete and unfiltered examination of the tactics and consequences behind the largest deportation campaign in modern U.S. history

Wayne Cornelius's avatar
Wayne Cornelius
Mar 05, 2026
∙ Paid

This essay offers a unique and comprehensive description of Trump’s deportation campaign written by Wayne A. Cornelius, one of the nation’s leading experts on migration.

During his 2024 presidential campaign, Donald Trump promised that, from “day one” of his return to office, he would launch the largest deportation program in American history. He pledged to remove at least one million migrants every year.

Yet, Trump faced an immediate challenge: there weren’t enough border-crossers to deport.

Most deportations regularly take place at the border, when migrants are caught attempting to cross without authorization. By the time Trump returned to power, however, illegal crossings had already fallen to levels not seen since 1970 because, between 2023 and 2024, President Biden barred asylum requests at the border and required immediate detention and removal.

Source: CBP

This sharp decline in arrivals meant that, to fulfill his promise, Trump had to shift his focus inward, toward deportations from within the country.

The result has been a sweeping enforcement campaign that reshapes federal power, tests the limits of executive authority, and drives the most ambitious deportation effort in modern American history.

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Wayne Cornelius's avatar
A guest post by
Wayne Cornelius
Professor emeritus of Political Science and US-Mexican Relations, UC San Diego
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