Immigration was the centerpiece of Trump's 2024 campaign and has become one of the most active policy areas of his second term. On Day One, more than a dozen executive orders and proclamations reshaped U.S. immigration law. This guide covers every major change, the legal battles that followed, and the real-world impact on the southern border and interior enforcement.
10 min readUpdated March 2026
Key Policy Areas
Border Security and Physical Barriers
On Inauguration Day, Trump declared a national emergency at the southern border and immediately issued executive orders to resume border wall construction using Defense Department funds. Military personnel were deployed to the border to assist with enforcement operations. The administration moved to reinstate a range of first-term border security measures that the Biden administration had rescinded.
Deportation Operations
The administration launched large-scale interior enforcement operations coordinated by ICE, DHS, and other federal agencies. The operations prioritized criminals and gang members but included broad enforcement actions in major cities, including cities that previously had sanctuary policies. The administration announced intentions to conduct the largest deportation operation in American history.
Remain in Mexico / Migrant Protection Protocols
Trump reinstated the Migrant Protection Protocols (MPP), requiring asylum seekers arriving at the southern border to wait in Mexico while their cases are processed in U.S. immigration courts. The Biden administration had ended MPP; the Supreme Court had ruled in 2022 that the administration had discretion to do so. Trump's reinstatement faced legal challenges, but initial courts allowed it to proceed.
Birthright Citizenship Restriction
An executive order signed on Inauguration Day directed federal agencies to stop recognizing automatic birthright citizenship for children born on U.S. soil to parents who are neither citizens nor lawful permanent residents. Courts immediately blocked this order, finding it almost certainly unconstitutional under the Fourteenth Amendment's Citizenship Clause. The order triggered major constitutional litigation that may reach the Supreme Court.
Asylum Restrictions
The administration implemented multiple restrictions on the asylum system, including ending the CBP One app that allowed migrants to schedule border appointments, restricting which nationalities could use certain humanitarian parole programs, and tightening the "credible fear" standards used to screen asylum claims. The aggregate effect significantly reduced the volume of asylum claims being processed.
Cartel Terrorist Designations
By executive order, Trump designated several Mexican drug cartels and foreign criminal organizations as Foreign Terrorist Organizations (FTOs) and Specially Designated Global Terrorists (SDGTs). The designations enable enhanced criminal prosecution, financial sanctions, and potentially military action under existing law. Mexico protested the designations as an infringement on its sovereignty.
Alien Enemies Act Invocation
In an unprecedented move, the administration invoked the Alien Enemies Act of 1798 against members of the Venezuelan gang Tren de Aragua, attempting to use the war-time statute to enable rapid deportations without standard immigration court proceedings. Courts immediately challenged the invocations, creating major litigation over the scope of this rarely-used authority.
DACA and Legal Immigration
The administration did not immediately wind down DACA but declined to expand the program and pushed for legislative resolution. Legal immigration levels were reviewed, with scrutiny of visa categories and refugee admissions. The refugee admissions cap was set at a historically low number, continuing the trend from Trump's first term.
Context: Why Immigration Is Central to the Second Term
Immigration was the single largest motivating issue for Trump voters in 2024, according to exit polls. Record levels of border crossings during the Biden administration — including a peak of over 300,000 encounters in a single month in late 2023 — created political conditions that made immigration a defining fault line in the campaign.
Trump and his team came into office with a prepared and detailed immigration enforcement plan, in sharp contrast to the improvised approach of the first term. Acting DHS Secretary Kristi Noem and border czar Tom Homan coordinated an enforcement surge that began on the first day. Border crossing numbers fell sharply in the weeks following the inauguration, which the administration pointed to as evidence of deterrence working.
Civil liberties organizations, immigration attorneys, and Democratic officials mounted immediate legal challenges to virtually every major policy change. The result has been a complex web of court injunctions, appeals, and emergency stays as federal courts at every level work through the constitutional questions raised by the administration's unprecedented use of executive authority in immigration enforcement.
Frequently Asked Questions
What is Trump's immigration policy in 2025?
Ending illegal border crossings, mass deportation operations, reinstating Remain in Mexico, building border barriers, designating cartels as terrorist organizations, and restricting asylum claims.
What happened to DACA under Trump?
DACA remains in legal limbo. The administration has not renewed permits and courts have been deciding its legality. Congressional action has repeatedly failed.
What is the Alien Enemies Act and how is Trump using it?
An 1798 law that allows rapid deportation of nationals of countries at war with the U.S. Trump invoked it against Tren de Aragua gang members. Courts immediately challenged the invocation.
Is the Trump border wall being built?
Yes. Construction resumed on Day One using Defense Department funds in sectors that had been halted under Biden. Large portions of the border remain without barriers.
