Trump’s border policies in his first term were designed to deter crossings, so the “record encounters” story is mostly about how enforcement changes interacted with migration patterns, not one single policy. The biggest drivers were the end of broad “catch and release,” the Migrant Protection Protocols, asylum restrictions, family-separation deterrence, and pressure on Mexico to police migration more aggressively.

What changed

  • Asylum became harder to access. The administration narrowed eligibility and pushed people to wait in Mexico while cases moved forward, which changed how and where migrants tried to enter.
  • Migrant Protection Protocols (MPP) forced many asylum seekers to remain in Mexico during U.S. proceedings, reducing easy entry and shifting border management tactics.
  • Expanded enforcement and deportation efforts raised the risk of removal, which was meant to discourage repeat attempts.
  • Pressure on Mexico and regional enforcement reduced some flows before they reached the U.S. border, especially through transit countries.

Why encounters still surged

“Encounters” can rise even when enforcement is stricter, because the number reflects attempted crossings and border congestion, not just successful entries. When people believe rules are changing, they often rush to cross before new measures take full effect, which can create a spike. Broader conditions also mattered, including violence, poverty, and policy changes in the U.S. that made migration networks adapt rather than disappear.

The short version

The policies that mattered most were:

  1. Restricting asylum.
  2. Forcing many migrants to wait in Mexico.
  3. Increasing deportation and enforcement pressure.
  4. Using Mexico and regional partners to slow migration upstream.

Important nuance

If by “record number encounters” you mean a specific fiscal year or month, the explanation changes a bit depending on whether you are asking about Trump’s first term or his current term. In the first term, the main pattern was that tougher enforcement changed migrant behavior but did not eliminate the underlying flows, so encounters could still remain very high or spike in response to policy shifts.