Can Near-Historic Low Migrant Encounter Levels at the U.S.-Mexico Border Be Sustained?

Good question, force only or with other migration management measures that started under the Biden administration:

Migrant encounters at the U.S.-Mexico border have fallen to lows not seen since the 1960s. In April, the U.S. Border Patrol reported intercepting fewer than 8,400 irregular crossers—a stark contrast from the record high of nearly 250,000 encounters witnessed in December 2023. And data picked up elsewhere in the Western Hemisphere suggest unauthorized migration headed northward is slowing across the region: Reporting from the Darien Gap, the treacherous jungle that divides Panama and Colombia, shows there were just 200 crossings in March, compared to more than 37,000 the same month a year earlier.

With these near-historic lows, the Trump administration can rightfully claim that it has secured the border at this time, building on declines that began in early 2024 and accelerated in the second half of the year. The longer-term test, however, is whether this success can be sustained through the administration’s new show of force alone, without the less visible migration management ingredients that led to the quieting border the administration inherited.

A Year-Long Story of Reduced Migrant Flows 

The current lows build on a pattern of reduced irregular arrivals that started with changes in Biden administration policies in early 2024. Amid the record level of Southwest border arrivals witnessed in December 2023, which came on the heels of two years of record border encounters during the Biden administration, the U.S. and Mexican governments negotiated increased Mexican enforcement at Mexico’s northern border and throughout the country, including checkpoints throughout well-traveled interior routes.

With this ongoing additional enforcement from Mexico, irregular arrivals at the U.S.-Mexico border decreased by 53 percent between December 2023 and May 2024 (see Figure 1). The impact of Mexican enforcement cannot be overstated: Mexican authorities recorded more encounters than did the U.S. Border Patrol  every single month between May 2024 and March 2025 (the most recent month for which Mexican enforcement data are available).

Figure 1. Irregular Migrant Encounters by U.S. Border Patrol at U.S.-Mexico Border, 2023–25

Note: The data here reflect encounters recorded by the U.S. Border Patrol of migrants crossing the border without authorization; U.S. Customs and Border Protection (CBP) Office of Field Operations encounters of migrants arriving at a U.S. port of entry without prior authorization to enter are not included here.
Source: CBP, “CBP Nationwide Encounters,” accessed May 29, 2025.

Following implementation of the Biden administration’s June 2024 Secure the Border rule,  irregular encounters continued to drop, with the ongoing aid offered by increased Mexican enforcement. This rule sought to disincentivize illegal entries and incentivize arrivals at a port of entry by further limiting access to asylum for those who crossed between ports of entry and permitting an appointment, through use of the CBP One app, to be screened at an official port of entry. Those who entered through the CBP One app could later go on to apply for asylum.

Irregular crossings dropped from 84,000 that June to 47,000 in December, a 43 percent decrease. Notably, encounters in December 2024 were 81 percent lower than the same month a year earlier. Proof that the carrot-and-stick approach was beginning to turn the tide was seen in November 2024, when for the first time more migrants arrived at ports of entry than between (see Figure 2). Though by a small margin, this shift established a pattern of more migrants seeking to enter lawfully via CBP One rather than risk entering irregularly.

Figure 2. Migrant Encounters At and Between Ports of Entry at U.S.-Mexico Border, 2024

Note: Office of Field Operations (OFO) encounters occur at ports of entry; U.S. Border Patrol encounters occur between ports of entry.
Source: CBP, “CBP Nationwide Encounters.”

Inheriting an Increasingly Quiet Border

Thus, the current lows seen under the Trump administration represent a continuation of trends established during the prior administration—and momentum the Biden team put in place by increasing migration management cooperation with Mexico and other countries in the Western Hemisphere as well as further narrowing access to asylum at the U.S.-Mexico border. However, upon taking office, the Trump administration shuttered many of the programs that had become the basis for dramatic reductions in irregular arrivals.

During his first days in office, President Donald Trump declared a national emergency at the border and a migrant “invasion.” By cancelling use of the CBP One app while leaving the Secure the Border rule restrictions in place, the Trump administration made asylum inaccessible at the U.S.-Mexico border.

Most notably, the administration terminated access to Biden-era humanitarian pathways that had helped reduce chaotic arrivals at the Southwest border. The Trump administration swiftly ended admissions under the Cuban, Haitian, Nicaraguan, and Venezuelan (CHNV) parole program, which reduced irregular encounters of those nationalities at the border by 92 percent between October 2022 and December 2024. Nearly 532,000 individuals were admitted through the CHNV program, allowing them access to work permits and temporary relief from deportation. The administration also closed the Safe Mobility Offices (SMOs) that had been set up in Colombia, Costa Rica, Ecuador, and Guatemala to consider migrants for refugee resettlement or other lawful pathways before they reached the U.S. border. More than 40,000 people were approved for U.S. refugee status through the SMOs.

Source: Can Near-Historic Low Migrant Encounter Levels at the U.S.-Mexico Border Be Sustained?