Trump v. Vance, 591 U.S. 786

New York County DA Cyrus Vance subpoenaed Mazars (Trump's accountant) for President Trump's financial records, including tax returns (2011–present); Trump sued to enjoin enforcement claiming Article II and Supremacy Clause protection.
District Court dismissed on Younger abstention; Second Circuit held Younger inapplicable and denied preliminary injunctive relief on the merits.
Central legal questions: (1) whether a sitting President is absolutely immune from a state criminal subpoena; (2) whether a heightened "need" standard applies to state grand‑jury subpoenas for a President's private papers.
Historical precedent (Burr, Nixon, practice of Presidents testifying or producing documents) establishes that Presidents have submitted to subpoenas in federal proceedings and that privilege may yield to demonstrated need.
The Solicitor General urged a heightened-need test; the DA argued ordinary subpoena standards should apply; the Court considered risks the President raised (diversion, stigma, harassment).
Supreme Court held: no absolute immunity and no categorical heightened-need rule for state criminal subpoenas to a sitting President; remanded for further proceedings where specific constitutional or state‑law objections can be raised.

Issue	Plaintiff's Argument (Trump)	Defendant's Argument (Vance)	Held
1. Absolute immunity from state criminal subpoenas	Article II + Supremacy Clause bar state criminal subpoenas to a sitting President	No absolute immunity; historical practice and precedent allow subpoenas	No absolute immunity; President not categorically exempt
2. Heightened "need" standard for state grand‑jury subpoenas for private papers	State subpoenas must meet a heightened showing ("critical," last resort)	No special standard; treat like ordinary subpoenas	No heightened-need rule; state subpoenas need not exceed federal standard
3. Diversion, stigma, harassment concerns	Subpoenas will distract President, stigmatize, and invite politically motivated harassment	Protections exist (grand jury secrecy, bad‑faith/burden challenges, federal relief)	Risks insufficient to justify categorical protection; existing safeguards and judicial review suffice
4. Available remedies / forum to challenge subpoenas	Seek federal declaratory/injunctive relief to block enforcement	Enforcement should proceed subject to ordinary challenges in state court	President may raise constitutional and subpoena‑specific objections in state or federal court; remand for further proceedings

United States v. Nixon, 418 U.S. 683 (1974) (presidential communications privilege yields to demonstrated, specific need in criminal prosecutions)
Nixon v. Fitzgerald, 457 U.S. 731 (1982) (absolute immunity from damages for official acts)
Clinton v. Jones, 520 U.S. 681 (1997) (no absolute immunity for unofficial conduct; distraction alone insufficient)
McCulloch v. Maryland, 4 Wheat. 316 (1819) (Supremacy Clause bars state action that retards or impedes federal constitutional functions)
Younger v. Harris, 401 U.S. 37 (1971) (federal courts should generally abstain from interfering with ongoing state criminal proceedings)
R. Enterprises, Inc. v. United States, 498 U.S. 292 (1991) (grand juries cannot be used as arbitrary fishing expeditions; broad investigatory access)
In re Sealed Case, 121 F.3d 729 (D.C. Cir. 1997) (applies Nixon's demonstrated‑specific‑need principle to certain grand‑jury subpoenas for executive materials)
Ex parte Young, 209 U.S. 123 (1908) (federal courts may enjoin state officials acting unconstitutionally)