PBS NewsHour has published a "What to know" explainer on the Trump administration's new attempt to limit birthright citizenship, returning a long-running constitutional question to national headlines.

The explainer arrives as immigration attorneys, agency officials, and federal judges await new court rulings and agency guidance on the scope of the Fourteenth Amendment's citizenship clause.

What the PBS headline tells readers

The headline — "What to know about Trump's new attempt to limit birthright citizenship" — signals two things at once. The Trump administration is making a fresh legal push on the citizenship question. PBS considers the topic important enough for a standalone explainer. The "What to know" format signals a reader-friendly primer aimed at non-specialists.

The constitutional foundation

Birthright citizenship in the United States rests on the opening sentence of the Fourteenth Amendment, which Congress sent to the states on June 13, 1866, and which the states ratified on July 9, 1868. Federal courts have generally read the text to extend citizenship automatically to anyone physically born on US soil.

The leading Supreme Court precedent is United States v. Wong Kim Ark, decided in 1898. The Court held that the US-born children of Chinese parents domiciled in the United States were citizens by birth under the Amendment.

What the Trump administration has argued

The administration has taken the position, in earlier executive orders and Department of Justice filings, that the phrase "subject to the jurisdiction thereof" excludes the children of undocumented immigrants and certain temporary visa holders. Children of US citizens and lawful permanent residents would be unaffected under that reading.

Where the litigation stands

Federal district courts have already entered preliminary injunctions against the original executive order. The Supreme Court has heard oral argument on related standing questions and issued rulings narrowing the use of nationwide injunctions, while leaving the underlying constitutional question unresolved.

The PBS explainer comes as the administration tests different legal vehicles — including narrower agency guidance — designed to fit within the limits set by those rulings.

Who the policy would reach

If implemented, the policy would primarily affect US-born children in families where at least one parent is:

• An undocumented immigrant
• A temporary foreign worker on H-1B, H-2A, H-2B, or L-1 status
• An international student on F-1 or J-1 status
• A short-term visitor in B-1/B-2 status

The Migration Policy Institute has put the number of US citizen children in mixed-status families at roughly 4 million.

What remains uncertain

Key open questions include whether the Supreme Court grants review on the merits, how the Department of Homeland Security updates its Policy Manual, whether Congress attempts legislation, and how state vital records offices document births in mixed-status families.

Primary sources to follow

Readers should anchor updates to:

• The Federal Register, where new rules and executive orders appear
• The Department of Justice, which issues litigation updates
• US Citizenship and Immigration Services, which sets adjudication policy in its Policy Manual
• The State Department, which sets passport issuance policy
• Federal court dockets, accessible through the PACER public records system

PBS NewsHour's explainer is the latest in a string of mainstream primers from outlets including The New York Times, The Washington Post, and CNN covering the same constitutional question since the start of the second Trump administration. Readers seeking the administration's official rationale should consult the White House briefing room and the Department of Justice Office of Public Affairs.