Sen. Blackburn Sues to Block Jack Smith Subpoena Citing Speech or Debate Clause
The lawsuit tests whether the Constitution's legislative immunity provision shields a sitting senator's communications from a special counsel inquiry into events surrounding the 2020 election.
Senator Marsha Blackburn (R-TN) filed a federal lawsuit on September 30, 2026, challenging a subpoena issued by former Special Counsel Jack Smith, arguing that the Constitution's Speech or Debate Clause bars prosecutors from compelling her testimony or records related to legislative activities conducted during the inquiry into former President Donald Trump, according to reporting by The New York Times.
The Speech or Debate Clause, found in Article I, Section 6 of the U.S. Constitution, states that senators and representatives "shall not be questioned in any other place" for "any Speech or Debate in either House." The clause has historically shielded members of Congress from civil and criminal proceedings tied to their legislative functions, though courts have drawn distinctions between legislative acts and political or personal conduct.
Blackburn's lawsuit represents a direct constitutional challenge to the reach of Smith's subpoena. The specific records or testimony sought by the subpoena have not been publicly disclosed in court filings available as of the publication of this article. The full complaint would clarify which communications or actions Smith's team sought to compel.
Jack Smith was appointed Special Counsel by Attorney General Merrick Garland in November 2022 to oversee federal investigations related to Trump, including the probe into efforts to overturn the 2020 presidential election results. Smith resigned from the special counsel role in January 2025 after Trump's return to the presidency. Whether Smith retained any formal authority to enforce subpoenas after that departure is a question the litigation may be required to address.
The Speech or Debate Clause has been litigated in several prominent cases involving members of Congress. In Gravel v. United States (1972), the Supreme Court held that the clause protects legislators and their aides for acts that are an "integral part of the deliberative and communicative processes" of Congress, but does not extend to activities outside that sphere. In United States v. Rayburn House Office Building (2007), the U.S. Court of Appeals for the D.C. Circuit ruled that executing a search warrant on a congressional office implicated the clause, though it did not confer absolute immunity.
The outcome of Blackburn's lawsuit will likely depend on how a court characterizes the specific conduct Smith's subpoena targeted. If the subpoena sought records tied to floor speeches, votes, or formal committee work, courts have historically applied broad clause protections. If it targeted communications with campaign operatives, outside attorneys, or party officials, courts have generally found the clause does not apply.
Blackburn represents Tennessee and has served in the Senate since January 2019. Her office has not issued a public statement beyond the litigation itself, as of the date of this article. Smith's representatives have not issued a public response to the lawsuit, and the Department of Justice has not commented on the matter in any public record reviewed for this story.
This lawsuit is not the first time a member of Congress has invoked the Speech or Debate Clause to resist a prosecutor's subpoena related to the January 6, 2021, period. In 2022, a federal judge ruled that the clause did not fully protect Representative Mo Brooks (R-AL) from a civil defamation suit filed by Representative Eric Swalwell (D-CA), though the facts in that case differed significantly from a criminal subpoena context.
The party symmetry of the clause's application is worth noting. Democratic members of Congress have also invoked legislative immunity in past investigations. Senator Bob Menendez (D-NJ) cited Speech or Debate protections during his federal corruption proceedings, with courts granting partial but not absolute protection in that matter.
Several material facts remain unknown. The full text of Smith's subpoena has not been entered into a public docket as of publication. It is also unknown whether any other members of Congress received similar subpoenas from Smith's office that they did not challenge. The court docket for Blackburn's lawsuit, once available through PACER (the federal courts' public access system), would provide the complaint text, the specific records at issue, and any government response filed.