The Supreme Court struck down President Trump's executive order restricting birthright citizenship in a 6-3 ruling, but the justice Trump once called his "new hero" handed Congress a detailed roadmap for getting to the same destination through legislation. Justice Brett Kavanaugh, voting with the majority, wrote a concurring opinion arguing that Congress has the constitutional authority to carve out exceptions to birthright citizenship for children born to illegal immigrants or temporary visitors, Fox News Digital reported.
The ruling means Executive Order 14160, which would have limited automatic citizenship to children born to U.S. citizens or permanent residents, cannot take effect. But Kavanaugh's concurrence, combined with a sharp dissent from Justice Clarence Thomas and immediate legislative pledges from Republican senators, signals that the fight over birthright citizenship is far from settled.
Within hours of the decision, the GOP's congressional wing moved. Sen. Rand Paul renewed his push for a constitutional amendment. Sen. Tom Cotton pointed to his Constitutional Citizenship Clarification Act. And Trump himself posted on Truth Social urging lawmakers to act immediately, siding with Kavanaugh's view that a simple statute, not a constitutional amendment, could do the job.
Kavanaugh agreed with the majority that a president cannot use an executive order to override a law Congress already passed. But he parted ways on the deeper constitutional question. While a bare 5-4 majority concluded the Fourteenth Amendment's citizenship clause itself protects birthright citizenship, meaning any congressional fix would face steep constitutional headwinds, Kavanaugh argued the case should have been resolved under federal statute, not the Constitution.
His opinion zeroed in on §1401(a) of the Immigration and Nationality Act, the provision Congress first wrote into federal law in 1940 and carried over into the INA in 1952. In Kavanaugh's reading, that statute is where birthright citizenship lives as a practical matter, and Congress can amend its own statute.
"Congress could, consistent with the Fourteenth Amendment, amend §1401(a) or otherwise enact new legislation establishing exceptions to birthright citizenship for children born to foreign citizens unlawfully or temporarily in the country."
He grounded the argument in the Supreme Court's own 1898 precedent, United States v. Wong Kim Ark, which established that most people born on U.S. soil automatically become citizens. Kavanaugh noted that the Wong Kim Ark decision recognized four categories of exceptions. Children of illegal immigrants and temporary visitors, he wrote, "are relevantly similar" to those existing exceptions.
He also argued that large-scale illegal immigration and modern international travel created circumstances the Reconstruction-era Congress that drafted the Fourteenth Amendment never envisioned. It was a pointed observation, one that frames the current birthright citizenship regime as a product of outdated assumptions rather than timeless constitutional command.
This is not the first time Kavanaugh has sided against Trump on the bottom line while offering a clear alternative route. In a recent tariff case, the Supreme Court ruled that the International Emergency Economic Powers Act did not give Trump authority to impose sweeping tariffs. Kavanaugh concurred in that ruling too, but wrote separately to note that Trump could rely on several existing trade laws to impose many of the same tariffs, though those laws would require additional legal steps.
"The Court today concludes that the President checked the wrong statutory box by relying on IEEPA rather than another statute to impose these tariffs."
Trump responded to that earlier concurrence by calling Kavanaugh his "new hero" on Truth Social. The pattern is now established: Kavanaugh rejects the executive shortcut but maps the lawful detour. Whether Congress and the White House follow the map is another question entirely.
The Court's internal dynamics this term have drawn unusual public attention. Justice Sotomayor recently apologized for personal remarks aimed at Kavanaugh, calling her own comments "inappropriate", a rare concession that hinted at the tensions running beneath the surface of a consequential term.
Justice Thomas, joined by Justices Samuel Alito and Neil Gorsuch, dissented. Notre Dame Law School professor Haley Proctor, speaking to Fox News Digital, characterized Thomas's closing argument this way:
"Justice Thomas says in the final paragraph of his dissent that he's not confident that the decision is going to stand the test of time, so it could well be that the court would revisit it if Congress were to take the steps that Justice Kavanaugh describes."
That framing matters. If Thomas is right, Kavanaugh's concurrence is not just an academic exercise. It is an invitation, and a potential vehicle for a future challenge. A new federal statute restricting birthright citizenship would almost certainly face immediate legal attack. But it would also force the Court to confront the question on different procedural ground, with Congress rather than the president as the moving party.
Alito's dissent was even more direct. National Review reported that Alito called the ruling "one of the most important decisions in the history of the Court" and said the majority had made "a serious mistake." He warned of potential national security consequences, a concern echoed by Sen. Eric Schmitt, who flagged security risks linked to China in the wake of the decision.
Proctor, however, counseled realism about the path forward. She told Fox News Digital that the Court is unlikely to revisit the question lightly.
"This is an important decision. I don't think the court's going to revisit it lightly, and the only sure way to get a new answer here would be to amend the Constitution."
That tension, between Kavanaugh's statutory path and the brute reality of a 5-4 constitutional holding, is the central fault line in the Republican response.
House Speaker Mike Johnson spoke to reporters hours after the ruling dropped. He acknowledged the policy's original intent but conceded the legal landscape had shifted.
"It's one of those things that was intended to serve a noble and important purpose and has been thwarted and overused and abused."
Johnson added that the ruling likely means Congress will have to amend the Constitution, a far heavier lift than passing a statute. A constitutional amendment requires two-thirds approval in both chambers and ratification by three-fourths of the states, a threshold no politically divisive proposal has cleared in decades.
Sen. Rand Paul, who introduced a constitutional amendment months before the ruling, posted on X to renew his push:
"I introduced a constitutional amendment months ago, actually, to fix birthright citizenship. After the Supreme Court decision, that amendment matters more than ever. I'm asking my colleagues to take it seriously and help me get this passed."
Sen. Mike Lee struck a similar note, also posting on X:
"The long fight for a constitutional amendment begins now. We must explicitly exclude foreign nationals who break our laws, violate our borders, or exploit loopholes to make their families American."
Other Republicans pursued narrower strategies. Sen. Tom Cotton's Constitutional Citizenship Clarification Act represents the statutory approach Kavanaugh's concurrence would support. Sens. John Cornyn and Rick Scott have separate proposals aimed at cracking down on birth tourism specifically. The Justice Department, meanwhile, announced it would shift tactics, targeting alleged visa fraud and related criminal conduct associated with birth tourism rather than attempting to enforce the now-dead executive order.
Newsmax reported that more than 250,000 babies born in the United States each year would have been affected by the executive order. That figure underscores the scale of the policy question Congress now faces, and the political stakes attached to any legislative fix.
The president wasted no time making his preference clear. On Truth Social, Trump urged Congress to bypass the amendment process entirely:
"No long and unwieldy Constitutional Amendment is necessary! Congress should start TODAY to work on ending expensive and unfair to our Country, Birthright Citizenship. They will have my Complete and Total Support!"
That position aligns squarely with Kavanaugh's concurrence and diverges from the amendment route favored by Paul, Lee, and Johnson. It also sets up a potential intraparty debate: does Congress pursue the faster but legally riskier statutory path, or invest years in the amendment process that virtually guarantees a durable result?
Just the News reported that Chief Justice John Roberts wrote the majority opinion, joined by Justices Kavanaugh and Amy Coney Barrett alongside the Court's three liberal justices. RealClearPolitics noted the case was styled Trump v. Barbara, and that the ruling centered on the interpretation of "subject to the jurisdiction thereof" in the Fourteenth Amendment's citizenship clause.
The Court has delivered several landmark rulings this term. It recently upheld state bans on biological males in women's sports in another 6-3 decision, and it agreed to hear an AR-15 ban challenge it had previously sidestepped. The birthright citizenship ruling, however, may carry the longest political tail of any decision this term.
Roberts wrote for the majority that children born on U.S. soil to parents here illegally or temporarily satisfy both elements of the citizenship clause: they are "born... in the United States" and "subject to the jurisdiction thereof." Under the Constitution, he concluded, "they are citizens at birth."
Five justices endorsed that constitutional holding. One, Kavanaugh, agreed only on statutory grounds, meaning the constitutional question was decided by the narrowest possible margin. That thin majority is precisely why Thomas expressed doubt the ruling would endure, and why Kavanaugh's legislative roadmap carries real weight.
The question now is whether congressional Republicans can agree on a vehicle. The statutory route is faster but would invite an immediate court challenge under the 5-4 constitutional holding. The amendment route is slower but more durable. The birth tourism crackdown is the narrowest option, administratively achievable and politically defensible, but far short of the systemic reform Trump and his allies want.
Six justices told the president he picked the wrong tool. One of them handed Congress the right one. Whether lawmakers pick it up, and which version they choose, will say more about the GOP's seriousness on immigration than any executive order ever could.
