Donald Trump lost his bid to restrict birthright citizenship at the Supreme Court in June 2026. In August, he signed another executive order. By September, families were suing again in Nathan v. Trump. Why does the fight continue after the Court has ruled? Starting with Trump's renewed challenge, this episode examines the legal battle behind Trump v. CASA, the class-action response, and the six-to-three decision in Trump v. Barbara. The constitutional arguments reach back to Reconstruction and Wong Kim Ark, the American-born son of Chinese immigrants whose citizenship the government refused to recognize. Five justices backed the constitutional guarantee in Barbara; a sixth rejected the order on statutory grounds. Their disagreement helps explain what Trump can still try, what the Constitution protects, and why families may need to return to court to enforce it. Hi, I'm Mason Hu, a lawyer in China. This is Reasoned Talk, a podcast about legal history in China and the West. Key dates1857: Dred Scott v. Sandford denies federal constitutional citizenship to the class of people of African descent described in the decision, including free descendants of enslaved people. 1866: Congress enacts the Civil Rights Act of 1866, including a statutory citizenship provision. 1868: The Fourteenth Amendment constitutionalizes a citizenship guarantee and overturns Dred Scott's citizenship rule. 1895: Wong Kim Ark is refused entry at San Francisco after a visit to China. March 28, 1898: United States v. Wong Kim Ark is decided, 6–2. January 20, 2025: Trump signs Executive Order 14160. Its section 2 sets out the two parental-status categories and its prospective application. June 27, 2025: Trump v. CASA limits universal injunctive relief without deciding the citizenship order's substantive legality. Barbara v. Trump is filed the same day. July 10, 2025: The New Hampshire district court provisionally certifies a nationwide class of affected children and issues a class injunction, stayed for seven days to allow appellate review. The certified class excludes parents and uses births on or after February 20, 2025. April 1, 2026: The Supreme Court hears argument in Trump v. Barbara. June 30, 2026: The Court affirms the district court. Six justices vote against the executive order; five join the constitutional holding. Kavanaugh relies on the statute for the result and expressly rejects the constitutional holding. August 6, 2026: Trump signs Executive Order 14418, claiming to identify additional categories outside the birthright-citizenship rule recognized in Barbara. August 11 and September 9, 2026: Plaintiffs' counsel announce further motions concerning a subsequent executive order. These entries identify litigation activity, not adjudicated outcomes. September 28, 2026: Nathan v. Trump, No. 1:26-cv-03377, is filed in the District of Columbia, challenging the August order and implementing agency actions. A new complaint is not a new constitutional ruling. Sources and readingThe constitutional text: National Archives, The Constitution: Amendments 11–27, Amendment XIV, sections 1 and 5. The Script paraphrases the citizenship sentence and quotes only its jurisdiction qualification. Dred Scott: Dred Scott v. Sandford, 60 U.S. (19 How.) 393 (1857), especially the citizenship ruling and denial of federal jurisdiction. The scope is described in relation to the class identified in the opinion; the episode does not equate the decision with a holding that every person of every African background had identical circumstances. Wong's circumstances and the 1898 holding: United States v. Wong Kim Ark, 169 U.S. 649 (1898), especially pp. 652–653, 674–675, 682, 693, and 705. The agreed record identifies his 1873 birth, his parents' permanent domicile, his 1895 return, and their lack of diplomatic employment. The script separates those facts from later disagreement about how broadly the reasoning applies. Chinese exclusion and racial naturalization restrictions are not described as already in force at his birth. What the order actually directs: Executive Order 14160, “Protecting the Meaning and Value of American Citizenship”, January 20, 2025, 90 Fed. Reg. 8449, especially sections 2–3. Both categories retain the specified condition concerning the father. The order's date is distinguished from its Federal Register publication on January 29. Its recognition and documentation directions are distinguished from a lawful amendment of constitutional citizenship. CASA and the limits of interim relief: Trump v. CASA, Inc., Nos. 24A884, 24A885, and 24A886, June 27, 2025. See Barrett's opinion, especially slip pp. 1–5, 19, 21–24, and 26, and Sotomayor's dissent. The Court addressed the likely limits of equitable authority conferred by the Judiciary Act, partially stayed relief exceeding what plaintiffs required, and did not decide the order's merits. The script avoids saying citizenship actually became different from state to state as an automatic result of CASA. The representative procedure: Federal Rule of Civil Procedure 23, especially subdivisions (a), (b)(2), and (c). The four general prerequisites and the additional basis for classwide injunctive relief are both relevant. The class definition and injunction: Barbara v. Trump, No. 1:25-cv-00244-JL-AJ, Document 65, D.N.H., July 10, 2025, especially printed pp. 9–11 and 36–38. This is the district court's order, reproduced by Justia. The proposed class included parents; the certified class did not. The order uses February 20, 2025, as the first date of birth and provides a seven-day stay. The substantive decision and separate opinions: Trump v. Barbara, No. 25-365, 609 U.S. ___ (2026), argued April 1 and decided June 30, 2026. Roberts's opinion occupies PDF pages 6–31 (slip pp. 1–26); Jackson's concurrence, PDF pages 32–51; Kavanaugh's opinion, PDF pages 52–61; Thomas's dissent, PDF pages 62–152; Alito's dissent, PDF pages 153–191; Gorsuch's dissent, PDF pages 192–194. Page numbering restarts for each opinion. Kavanaugh's slip p. 1 expressly rejects the constitutional holding while finding a statutory violation. Jackson's concurrence discusses Reconstruction and caste; the three dissents are characterized by their legal arguments, without adopting their historical conclusions as settled fact. The procedural posture remains review of preliminary relief, even though the Supreme Court resolves the constitutional issue. The separate statutory protection: 8 U.S.C. § 1401, especially subsection (a), with subsection (b) relevant to the historical tribal-citizenship distinction. The script does not suggest that Congress can override Barbara's constitutional holding merely by amending this provision. The post-decision requests: ACLU, August 11, 2026 announcement and September 9, 2026 announcement. These are statements by counsel for the plaintiffs, used in the timeline to identify their requests for clarification and a new class. Their characterizations of the order's legality are not presented as a subsequent judicial holding, and these announcements do not establish the latest docket status. Trump's renewed order: Executive Order 14418, “Continuing To Protect the Meaning and Value of American Citizenship”, August 6, 2026, especially sections 1–2. Section 2(b)(iv), read with section 2's condition that neither parent is a citizen, supplies the international-organization example in the closing. The order claims to implement exceptions within Barbara; the script identifies that as the administration's position, not an authoritative interpretation of the Supreme Court's holding. This example does not summarize every category in the order. The new case used in the opening: Nathan v. Trump, No. 1:26-cv-03377, Document 1, D.D.C., filed September 28, 2026, especially paragraphs 6–10, 29, 43, 49–50, and 94–102, and the requested relief. The complaint challenges the new order and implementing actions under the Fourteenth Amendment and 8 U.S.C. § 1401. Its treatment of the diplomatic exception and international-organization employment is attributed to the challengers. It is evidence of their claims and filing, not a judicial finding that the new order is unlawful. See also the filing docket reproduced by Justia and counsel's case summary for the withdrawal of the requests in Barbara and filing of a separate action in Washington. The script identifies a recent new lawsuit and makes no claim that no other litigation activity occurred afterward.