Removal Under Alternative Immigration Authority Moots Alien Enemies Act Injunction Appeal Absent a Certified Class

A. Precedents Cited

1) Mootness and “effectual relief”

• Uzuegbunam v. Preczewski — supplies the governing principle: a case is moot if the court can no longer provide “any effectual relief.” The Fifth Circuit treated the petitioners’ INA removals as eliminating any meaningful remedy from an AEA-focused injunction.
• Chafin v. Chafin and Knox v. Serv. Emps. Int'l Union, Loc. 1000 — reinforce that mootness turns on the practical ability to grant relief. Here, an order restraining AEA removal would not undo completed INA removals.
• Church of Scientology of Cal. v. United States and Mills v. Green — establish that when intervening events on appeal make effectual relief impossible, the appellate court must dismiss.

2) Class actions, certification, and mootness

• Sosna v. Iowa — central to the court’s reasoning: once certified, a class “acquired a legal status separate” from the named plaintiff, allowing litigation to continue even if the representative’s claim becomes moot. The Fifth Circuit used Sosna to underscore the converse: without certification, no separate entity exists to keep the case alive.
• Gerstein v. Pugh — cited alongside Sosna to frame the certified-class exception, but again in a way that highlighted the case’s missing prerequisite: certification.
• Fontenot v. McCraw and Slayman v. FedEx Ground Package Sys. — articulate the “general rule” that a putative class action becomes moot when the representative’s claim becomes moot before certification, while acknowledging exceptions. The Fifth Circuit emphasized that “no one” argued an exception applied here.

3) Why substitution could not be accomplished on appeal

• Oscar Priv. Equity Invs. v. Allegiance Telecom, Inc. (quoting In re Initial Pub. Offerings Secs. Litig.) — invoked to show that Rule 23 requires factual findings and resolution of disputes relevant to each requirement; the appellate court is not positioned to do the district court’s factbound certification work.
• Vizena v. Union Pac. R.R. Co. (quoting Allison v. Citgo Petroleum Corp.) — emphasizes certification’s “essentially factual basis” and the district court’s case-management role, further supporting the Fifth Circuit’s refusal to install new representatives for an uncertified class on appeal.

4) Background procedural authorities (contextual)

• Rumsfeld v. Padilla — used to note the typical one-petitioner/one-custodian structure of habeas and to underscore the unusual “class habeas” posture taken here.
• A.A.R.P. v. Trump (A.A.R.P. I), A.A.R.P. v. Trump (A.A.R.P. II), and A.A.R.P. v. Trump (A.A.R.P. III) — supply the rapid emergency history and, most importantly, the Supreme Court’s remand instructions and its express statement that the government “may remove the named plaintiffs or putative class members under other lawful authorities.” The Fifth Circuit treated the subsequent INA removals as “unobjectionable” against that backdrop.

5) The concurrences’ merits-framework authorities (not adopted by the majority)

• Judge Ho relied on United States v. Abbott and Munaf v. Geren to argue that, at the preliminary-injunction stage, the court may deny relief on the merits rather than resolve jurisdictional questions first, and urged answering the Supreme Court’s directed merits questions.
• Judge Oldham (concurring in the judgment) similarly cited United States v. Abbott and Mullin v. Doe to support denying injunctive relief without a strict “order of operations.”

B. Legal Reasoning

1. Intervening event: all named petitioners were removed from the United States under the INA.
2. Remedy mismatch: the relief at issue on appeal—an injunction against AEA-based removal—could not prevent, reverse, or meaningfully affect the petitioners’ INA removals. Therefore, the court could not grant “effectual relief” as required by Uzuegbunam v. Preczewski and related cases.
3. No certified class to preserve a live controversy: the case “currently remains uncertified,” and thus there was no separate legal entity whose claims could remain live under Sosna v. Iowa.
4. No appellate substitution of representatives: because class certification is fact-intensive and entrusted to the district court (Rule 23 findings; adequacy; typicality; ascertainability; etc.), the Fifth Circuit refused to substitute five new representatives for an uncertified class on appeal, while leaving that possibility open on remand.
5. Jurisdictional consequence: mootness eliminated Article III jurisdiction, requiring dismissal.

Notably, the majority did not answer the Supreme Court’s directed questions on AEA authorization or due-process notice; mootness prevented reaching them. The concurrences would have addressed merits questions notwithstanding mootness (in the preliminary-injunction posture), but that approach did not command the court.

C. Impact

• AEA litigation strategy and “mootness by alternative removal”: the decision signals that when challengers seek only to enjoin AEA removal, the government’s use of alternative INA authority to remove named petitioners can moot appellate proceedings, absent a certified class or a properly argued mootness exception.
• Class certification becomes decisive in emergency detention/removal cases: the court’s reliance on Sosna and Fontenot underscores that certification (or an established exception) is often the difference between continued adjudication and jurisdictional dismissal once named plaintiffs’ claims become moot.
• Appellate courts will resist “representative substitution” without Rule 23 findings: the opinion reinforces institutional limits: adequacy/typicality and other Rule 23 prerequisites are district-court determinations, not appellate improvisations.
• Unresolved merits create continued uncertainty: because the en banc court did not reach whether the AEA proclamation was lawful or what process is due, the substantive questions remain open for future cases with live plaintiffs and (likely) better-developed class posture.
• Foreshadowed merits debates: Judge Ho’s concurrence previews arguments likely to recur: deference to presidential “invasion” determinations; reliance on Ludecke v. Watkins; and the view that the AEA’s “invasion or predatory incursion” trigger is largely committed to executive judgment. Litigants should expect these themes to shape future AEA challenges.