The U.S. Supreme Court handed the Trump administration a major border enforcement victory Thursday morning, ruling 6-3 that a non-citizen standing on the Mexican side of the U.S.-Mexico border has not "arrived in the United States" and therefore holds no right to apply for asylum or demand inspection by immigration officers.
Justice Samuel Alito wrote the majority opinion, joined by Chief Justice John Roberts and Justices Clarence Thomas, Neil Gorsuch, Brett Kavanaugh, and Amy Coney Barrett. The three liberal justices, Sonia Sotomayor, Elena Kagan, and Ketanji Brown Jackson, dissented. Justice Sotomayor took the rare step of reading her dissent aloud from the bench.
The ruling overturns a Ninth Circuit Court of Appeals decision that had interpreted immigration law to mean a non-citizen "arrives in the United States" simply by encountering a U.S. official at a port of entry, even while still standing on Mexican soil. That interpretation, if left standing, would have required border officers to process asylum claims from migrants who had never set foot in the country.
The majority opinion cut through the legal fog with plain language. As the Daily Caller reported, the court's central holding came down to a straightforward reading of the statute:
"An alien standing in Mexico does not 'arriv[e] in the United States' by attempting, and failing, to set foot in this country. An alien 'arrives in the United States' only when he crosses the border."
Justice Alito reinforced the point with an appeal to common sense, as National Review reported:
"In ordinary speech, no one would say that a person 'arrives in' a place, for example, a house, a city, or a country, before the person enters that place."
That reasoning may sound obvious to most Americans. But the Ninth Circuit had managed to reach the opposite conclusion, ruling that merely approaching a U.S. official at the border, while remaining in Mexico, triggered full asylum protections under the Immigration and Nationality Act.
Justice Thomas joined the majority and filed a separate concurring opinion. Justice Jackson, in addition to joining Sotomayor's dissent, filed her own dissenting opinion as well.
The ruling directly upholds what is known as the "metering" policy, a practice that caps the number of daily asylum applications processed at the border. The policy allows officials to turn away migrants before they physically enter the United States.
What critics of the Trump administration rarely mention is that metering did not originate with this White House. The New York Post reported that the policy was first used under President Obama in 2016 and then expanded under Trump's first term. The Biden administration ended the practice, and the Trump administration reinstated it, calling it "a critical tool for addressing border surges."
White House spokeswoman Abigail Jackson responded to the ruling in clear terms:
"This is a tremendous win for the Trump Administration, the rule of law, and common sense."
It is worth noting that the same court, on the same day, backed a Trump administration move to strip deportation protections from approximately 350,000 Haitians and 6,000 Syrians, as Breitbart reported. That pair of decisions marked a decisive day for immigration enforcement at the high court.
Justice Sotomayor's decision to read her dissent from the bench signals the depth of the liberal bloc's disagreement. She accused the majority of warping the statute's meaning by fixating on a single word.
"The Court's illogical interpretation is driven almost entirely by a fixation on a single word: 'in.'"
That framing inverts the majority's logic. Alito argued the statute says what it says, that arriving "in" the United States means being inside the country. Sotomayor argued the court should read the law more broadly to cover anyone who presents themselves at a port of entry, regardless of which side of the line they stand on.
The three dissenting justices, all appointed by Democratic presidents, would have preserved the Ninth Circuit's interpretation and required border officers to process asylum claims from people who had not crossed the border. That position would have effectively barred the government from managing the flow of asylum seekers at ports of entry, a tool even the Obama administration found necessary.
This is not the first time the liberal minority has found itself on the losing end of a consequential Supreme Court term. The court has overruled Sotomayor's sharp objections on multiple occasions this term across a range of issues.
The practical effect is significant. Under the Ninth Circuit's now-overturned interpretation, a migrant standing in Tijuana who approached a U.S. customs officer at the San Ysidro port of entry could claim to have "arrived" in the United States and demand to be processed for asylum, even without ever stepping onto American soil.
The Supreme Court's ruling eliminates that claim. Immigration officers are not required to inspect or process asylum applications from individuals who remain on the Mexican side of the border. The government can now lawfully turn people back before they cross.
For the Trump administration, this amounts to legal validation of one of its core border enforcement tools. The case, Mullin v. Al Otro Lado, had been closely watched as a test of whether the courts would allow the executive branch to manage asylum processing capacity at overwhelmed ports of entry.
The ruling also rejected a 2024 appeals court interpretation that asylum rights attach to migrants at ports of entry regardless of which side of the border they occupy. That interpretation, had it survived, would have created a legal obligation for the federal government to process every person who showed up at a crossing, a recipe for operational paralysis at a time when border facilities were already strained.
Thursday's decision fits a broader pattern. Progressive legal organizations and Democratic-aligned plaintiffs have brought a series of challenges to Trump administration immigration policies, seeking to use the courts as a backstop against executive enforcement. The results, at the Supreme Court level, have been mixed at best for the left.
The court's willingness to read immigration statutes according to their plain text, rather than stretching them to accommodate policy preferences, has frustrated advocates who spent years arguing that the law required more permissive treatment of border arrivals. The Ninth Circuit, long the most receptive venue for such arguments, has now been reversed on a central question of asylum law.
That reversal follows a term in which the court has also left the left scrambling for alternatives after rulings on voting rights and other contested issues.
Several important questions remain unanswered by the ruling itself and by available reporting. The decision's full scope, whether it applies retroactively to pending asylum cases or only prospectively, is not yet clear. The specific factual scenario that gave rise to the case, and the full statutory provisions the majority relied upon, will become clearer as the full opinion circulates.
What is clear is the bottom line: six justices read the Immigration and Nationality Act and concluded that "arrives in the United States" means what it says. You have to be in the country to have arrived in the country.
The Ninth Circuit managed to reach the opposite conclusion. The Supreme Court, in a pattern that has become familiar, told the lower court it was wrong.
When the highest court in the land has to explain that standing in Mexico is not the same as being in America, the real question is how the legal system got so tangled that anyone needed to ask.
