Just days after he took office in 2017, President Donald Trump set out to make good on his campaign pledge to halt illegal immigration. In a pair of executive orders, he ordered “all legally available resources” to be shifted to border detention facilities and called for hiring 10,000 new immigration officers.

The logistical challenges were daunting, but as luck would have it, Immigration and Customs Enforcement already had a partner on its payroll: McKinsey & Company, an international consulting firm brought on under the Obama administration to help engineer an “organizational transformation” in the ICE division charged with deporting migrants who are in the United States unlawfully.

ICE quickly redirected McKinsey toward helping the agency figure out how to execute the White House’s clampdown on illegal immigration.

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