Legislative Shield

Introduction

The Constitution offers members of Congress an extremely broad -- and sometimes surprising -- protection from the law. Article I of the Constitution provides that senators and representatives, "for any Speech or Debate in either House," shall not be subject to answer in any other place for "their Speech or Debate in either House."¹

The goal of this provision is not to let members of Congress act with total impunity; rather, it is to prevent the executive and judicial branches from threatening Congress's members through litigation.

A current court case involving Representative LaMonica McIver has tested the boundaries of that protection. On August 26, 2026, the United States Court of Appeals for the Third Circuit held that Rep. McIver could not use the Speech or Debate Clause to dismiss most of the federal charges stemming from a 2025 confrontation outside an immigration detention facility during an inspection in which she was present. The Third Circuit affirmed the district court's ruling as to two counts and remanded a third for further proceedings.²

The McIver case raises the question of what conduct falls within the protected "legislative sphere" and, more broadly, where the line between protected and unprotected conduct ends. As the Supreme Court has noted, the "Speech or Debate Clause was framed to preserve the independence of the legislative department of the federal government by protecting legislators from being harassed or deterred by the executive or judicial departments through citations for contempt or similar proceedings."¹

The Speech or Debate Clause

The Speech or Debate Clause reflects the Framers' concern that legislators should be able to carry out their duties free from the threat of the other branches' punishing them for misconduct.

The protection applies "to all acts which are in any sense 'legislative' acts," including those that take place "in the course of the legitimate legislative sphere."³ Congressional investigation is one such act.

The Supreme Court has long recognized investigative and fact-finding activities as an essential part of the legislative process. In Eastland v. United States Servicemen's Fund, for example, the Court held that legislative investigations are "inextricably intertwined" with the lawmaking function and are thus protected by the Speech or Debate Clause.⁴

The need for investigation is especially important given the difficulty of effective supervision by the legislature. It is essential to Congress that its investigations be able to obtain information that the executive branch might otherwise withhold. The protection of the Speech or Debate Clause is therefore crucial; if Congress is to be effective, members of Congress cannot face criminal prosecution for conducting investigations even when those investigations are politically unpopular. Nevertheless, the protection does not extend to every activity in which a member engages. The Court has noted that "'Speech or Debate' does not embrace every activity by a Member of Congress in the performance of his duties, but only those of a legislative nature."⁵

The distinction between protected and unprotected conduct, then, is not between important legislative acts and unimportant non-legislative acts, but rather between acts that are in any way "legislative" or "in the course of the legitimate legislative sphere" and those that are not.³

The McIver Case

The dispute in the McIver case arose when she and two other representatives conducted an unscheduled inspection of Delaney Hall, a federal immigration detention facility in New Jersey, on May 9, 2025. Pursuant to statutory authority, Rep. McIver and her colleagues entered the facility to conduct the inspection.² After more than an hour inside the facility, the lawmakers were proceeding toward the main entrance when agents of the Federal Bureau of Investigation attempted to arrest Newark mayor Ras Baraka.

According to the Government, Rep. McIver placed herself between the mayor and a federal agent, struck the agent with her forearm, and attempted to restrain him. The Indictment separately alleged that she forcibly struck another Immigration and Customs Enforcement (ICE) officer while attempting to re-enter the facility.²

The Government charged Rep. McIver under 18 U.S.C. § 111 for "forcibly assaulting, resisting, opposing, impeding, intimidating, or interfering with [a] federal officer . . . while such officer is engaged in the performance of his official duties."⁶

Rep. McIver moved to dismiss the charges based on the unavailability of the Speech or Debate Clause, which the district court granted as to two counts. The Third Circuit affirmed the district court's ruling on those two counts.

The Court's Distinction

The court's reasoning wasn't that congressional oversight visits are not protected by the Constitution.

The Court explicitly recognized that "investigative conduct can be legislative conduct."² The reason in this case was that the conduct at issue constituted "physical interference with an arrest that was not an integral part of the legislative process."² The fact that the conduct occurred as part of an otherwise protected oversight visit did not make that conduct a protected legislative act. The Court's holding ensures that a member of Congress always has the constitutional right to perform a legitimate legislative act, no matter what other law enforcement officials may do in response to it, but a member does not have a general immunity from criminal law just because the member's conduct occurred in a context in which legislative acts are taking place. It is the "legislative act" that is protected by the Speech or Debate Clause, not the member's position in the Government.

The Location Is Not the Rule

One particularly interesting aspect of the Third Circuit's opinion concerns the location at which the alleged conduct took place.

During oral argument, the district court had observed that a portion of Rep. McIver's conduct occurred outside of the security gate of the facility. The court of appeals emphasized that location is not dispositive,² which is an important point since congressional investigations and oversight often take place outside of the chambers of the House or Senate.

If the location where the conduct takes place were a factor in determining whether the conduct is protected, many legitimate acts would no longer be protected by the Speech or Debate Clause. Instead, courts would have to evaluate each case based on the "where" of the conduct rather than the "what."

The Dissent

Judge Thomas Ambro agreed with the majority that Rep. McIver's attempt to stop the mayor's arrest was not a protected legislative act, but he dissented from the majority's analysis of the second count of the Indictment. Judge Ambro argued that the physical contact between Rep. McIver and an ICE officer occurred while she was attempting to re-enter the facility and continue inspecting the premises and that the court should decide whether the contact was an intentional attack or merely incidental to re-entry.²

Ambro's reasoning is correct; the identical conduct that occurred during Rep. McIver's oversight visit could just as easily have been an assault not connected to a legislative act.

It may be difficult in borderline cases to distinguish between acts that are an "intentional attack upon [another person]" and those that are "incident to an authorized inspection."² However, the question of what kind of conduct actually took place in this specific case is an issue that should be decided by a jury, not by a court at this stage in the proceedings.²

Oversight and Executive Power

This dispute raises an issue that goes beyond the Speech or Debate Clause and touches upon the separation of powers between the various branches of the United States Government.

Congress has the responsibility for overseeing the executive branch, which requires that Congress have access to the information and facilities of the government agencies that fall under its jurisdiction. If executive officials were to be able to stop members of Congress from conducting authorized inspections and if criminal prosecution were to follow any confrontation between members of Congress and federal agents, then members of the Congress would be less likely to exercise their supervisory responsibility. The dissenting opinion in this case specifically pointed to this potential problem as a reason why the Speech or Debate Clause should protect Rep. McIver from the charges against her.² The majority opinion did not accept this reasoning as justification for dismissing the charges. Instead, it held that Rep. McIver's selective- and vindictive-prosecution claims were not properly before the court because they were "nonjusticiable interlocutory appeals."²

The problem with this reasoning is that it assumes that if the Government were to try to punish members of Congress for carrying out their constitutional duties, the members could bring the matter before the courts as a matter of justiciability. Instead, it seems that if the Government were to use criminal law as a tool of retaliation against legislators, it would be an issue that should have been decided by the Supreme Court.

The Case for Limiting Immunity

The defense and the Government both have sound reasons why the Speech or Debate Clause should not protect all conduct of members of Congress from the operation of the criminal law.

If every act which occurs during a trip that a member of Congress takes to conduct an investigation were protected by the Speech or Debate Clause, the member would have an extremely broad immunity from criminal law that no other private citizen has. This would be an unwisely broad interpretation of the Speech or Debate Clause since it is not enough that the members should be free from interference in their legislative activities; they also must be held accountable under criminal law when they commit criminal acts, even if those acts are only incidentally related to legislative activities. It is hard enough to determine what conduct constitutes a "legislative act" in the first place. By limiting the application of the Speech or Debate Clause, the Court can ensure that members of Congress are still protected under the Constitution while not allowing them to abuse that protection by claiming that every action that they take is a protected "legislative" act.

Why It Matters

The Speech or Debate issue raised by the McIver case is an important one. Congress must retain the ability to investigate the executive and judiciary branches in order to hold them to account for their conduct. Congress cannot conduct effective investigations if its members can be threatened with criminal prosecution for doing their jobs. On the other hand, members of Congress also cannot claim that every action that they take, even if it has nothing to do with legislation, is a "legislative act" that is protected from the operation of the criminal law just because it took place while the member was conducting an investigation of the executive branch. The McIver case helps to draw that line in very specific terms. The Third Circuit recognized that the inspection of Delaney Hall was a legitimate legislative act but at the same time held that actions that Rep. McIver took in conjunction with that inspection were not automatically protected by the Speech or Debate Clause.

Conclusion

The protection given to members of Congress by the Speech or Debate Clause is necessary to ensure that the legislative branch of the Government can carry out its duties without being threatened by the executive and judicial branches. It is equally important, however, to ensure that this immunity is not abused by members of Congress who commit non-legislative acts. The McIver case is an example of how difficult it can be to distinguish between acts that are "in any sense 'legislative' acts" and those that are not.

1. U.S. CONST. art. I, § 6, cl. 1.

2. United States v. McIver, Nos. 25-3573 & 26-1122, slip op. at 1–5, 14–20 (3d Cir. Aug. 26, 2026). The Third Circuit affirmed denial of McIver's Speech or Debate Clause claim as to Counts One and Two and remanded Count Three for further consideration.

3. Gravel v. United States, 408 U.S. 606, 625 (1972).

4. Eastland v. United States Servicemen's Fund, 421 U.S. 491, 504–05 (1975).

5. United States v. Brewster, 408 U.S. 501, 512–16 (1972).

6. 18 U.S.C. § 111(a).