Supreme Court greenlights turning back asylum seekers at border ports—what it means

The Supreme Court’s Mullin v. Al Otro Lado decision on June 25, 2026 narrows a major asylum-court argument used at the U.S.-Mexico border: that federal officers must inspect people and begin asylum processing as soon as an asylum seeker reaches the “threshold” of a port of entry—even if the person is still standing on the Mexico side while being turned back.

What the Court decided

In a 6–3 ruling, the Court held that an alien who is standing in Mexico does not “arrive in the United States” by attempting to set foot in the country and being blocked at the border. The Court said “arrives in the United States” happens only when the person crosses the border. Under that reading, the INA does not entitle a person standing in Mexico to apply for asylum at that stage, and it does not require an immigration officer to inspect them before asylum processing begins.

What “metering/turnback” means in this case

The dispute centered on a DHS/CBP “metering” approach used during border surges. The Supreme Court’s description explains that officials limited how many people at a port of entry would be allowed to move forward for inspection and asylum processing, by preventing additional people from entering the United States beyond the number the port could process at the time.

The Court also emphasized that metering, as described in the case record, does not permanently bar asylum seekers—it delays the point at which some people can enter and seek asylum.

How this changes the federal-court battleground

Before Mullin, challengers often relied on statutory language and “arrival”/inspection theories to argue that courts should order access to asylum processing once someone reached the port-of-entry threshold and encountered CBP/DHS officers.

Mullin shifts that legal foundation. By tying “arrival” to crossing into the United States (not merely encountering officers at the threshold), the decision makes broader “inspect first, then process asylum” claims substantially harder to sustain for people still outside the country.

That doesn’t end all border asylum litigation. It changes which arguments are likely to survive: future cases may focus more on what happens once someone is treated as having arrived, and on other statutory or constitutional safeguards that still apply after entry.

Why it matters right now—and what to watch next

AP reported that the metering-style policy was not in place now, though the ruling clears the way for the government to use a similar approach if officials decide border conditions warrant it. For asylum seekers and advocates, the practical question shifts from “is inspection required at the threshold?” to how the government applies turnback/metering and what legal protections exist once a person is allowed to enter.

For readers tracking public accountability, the next signals are likely to be lower-court orders responding to Mullin, and whether DHS/CBP issues new guidance addressing how courts and litigants should understand “arrival” after this ruling.

Sources

• U.S. Supreme Court opinion (Mullin v. Al Otro Lado) — June 25, 2026
• Associated Press report on the Supreme Court ruling (Mullin v. Al Otro Lado)
• Center for Constitutional Rights press release on Mullin / asylum-rights impact claim
• SCOTUSblog case page (Mullin / Noem v. Al Otro Lado) — procedural orientation