The Supreme Court is weighing the legality of President Donald Trump's executive order to restrict birthright citizenship, and a left-leaning research organization just handed the administration a set of numbers that sharpen the case for reform. A Pew Research Center study published in March found that 320,000 babies were born to illegal immigrant mothers in the United States in 2023, accounting for roughly 9% of all 3.6 million births that year, Just the News reported.
That figure alone is striking. But the downstream math is even more so: roughly 245,000 of those newborns had fathers who were also neither citizens nor lawful permanent residents. And if Trump's order had been in effect over the past two decades, it would have applied to 5.1 million people born in the U.S. to illegal immigrant mothers between 2006 and 2023. Of those, 4.4 million had illegal immigrant fathers.
None of these numbers come from a conservative think tank or a White House press release. They come from Pew, a research outfit widely cited by progressives and mainstream media alike. That provenance makes the data harder for opponents of the executive order to dismiss.
Trump signed the order last year as a direct challenge to the longstanding practice of granting automatic citizenship to anyone born on U.S. soil, regardless of the parents' immigration status. The administration has framed the current system as one that "rewards illegal immigration" and has urged the Supreme Court to rule that children of temporary visitors and illegal immigrants should not be deemed citizens at birth.
The order was also designed to deter what critics call "birth tourism", the practice of pregnant foreign nationals traveling to the United States specifically to give birth, securing citizenship for their children. Pew's research found that approximately 9,000 children were born to "birth tourists" in 2023 alone.
One detail the administration has stressed: any ruling would apply only to future births. Children already born in the United States to illegal immigrants would not lose their citizenship. That distinction matters, though opponents of the order have often blurred it in public debate.
Trump has also made a historic appearance at the Supreme Court in connection with the case, underscoring how central this issue is to his broader immigration agenda.
The legal fight centers on the 14th Amendment, ratified in 1868. The United States established birthright citizenship that year, and Trump has argued the amendment was originally intended to confer citizenship on the children of slaves after the Civil War, not to serve as an open-ended guarantee for the offspring of anyone who happens to be on American soil at the time of delivery.
Courts have since ruled that the amendment also pertains to children of immigrants, a reading that has gone largely unchallenged for generations. The administration's executive order now asks the Supreme Court to revisit that interpretation in a case with enormous constitutional stakes.
The legal battle is hardly the only front where the administration has tested the judiciary. In a separate matter, the D.C. Circuit recently sided with the Trump administration in a dispute over deportation flights, part of a pattern of appellate wins that has frustrated the administration's critics.
Pew's research also put American birthright citizenship policy in global context, and the picture is not flattering to defenders of the status quo. Only 52 countries worldwide allow a child to gain citizenship simply by being born within their borders. Another seven require parents to apply for their children to be declared citizens.
Of those 59 nations, 17 grant birthright citizenship only when the parents are living in the country legally. Another 26 countries require at least two generations of in-country birth before citizenship is conferred. In total, only 32 other countries have passed citizenship laws similar to America's broad, unconditional birthright standard.
Put plainly: the United States is an outlier. Most of the developed world, including virtually every European nation, does not grant automatic citizenship to children born to people who entered the country illegally or arrived on a temporary visa. The question before the Supreme Court is whether the Constitution actually requires the U.S. to remain that outlier, or whether decades of judicial interpretation have stretched the 14th Amendment beyond its original purpose.
That question has drawn intense political interest. Democrats who once voiced skepticism about birthright citizenship have found their past statements resurfacing, as former senators Harry Reid and Dianne Feinstein's own words on the subject have complicated the left's united opposition to Trump's order.
The Pew data also illuminates the executive order's reach beyond illegal immigration. The study found that the order would also affect mothers who were granted temporary legal status and gave birth while they were lawfully present in the United States but were not actual citizens. That category adds a layer of complexity, and political sensitivity, to the debate.
Still, the core numbers are hard to argue with. Nearly one in ten births in the country in 2023 involved an illegal immigrant mother. Over the span of nearly two decades, the cumulative total reaches into the millions. Those are not abstract policy projections. They are the real-world consequences of a system that, as the administration puts it, incentivizes illegal entry.
The Supreme Court has faced mounting public scrutiny as it handles a growing docket of high-profile cases tied to the Trump administration. Chief Justice Roberts has warned against "personally directed hostility" toward the Court, a sign of the pressure the justices face as they prepare to rule on an issue that touches the very definition of American citizenship.
Several key questions remain open. The exact text of Trump's executive order has not been widely published in full. The case name and docket number for the Supreme Court proceedings have not been specified in public reporting. And the timeline for a ruling is uncertain, the justices could act this term or push the matter further down the road.
What is clear is that the factual ground has shifted. When a research center trusted by the left produces data showing that hundreds of thousands of births per year are tied to illegal immigration, and that the United States stands nearly alone in the world in granting automatic citizenship under those circumstances, the case for reform stops being a partisan talking point and starts being a matter of plain arithmetic.
The administration did not need Pew's help to make the argument. But it certainly does not hurt when the other side's favorite pollster does the math for you.