
The U.S. Constitution grants Congress the power to issue subpoenas as part of its investigative authority. This power, known as the subpoena power, allows Congress to compel witnesses to testify and produce documents relevant to their inquiries. While Congress has broad authority to issue subpoenas, there are constitutional limits and legal considerations, such as the separation of powers, that come into play when subpoenas are challenged or when they involve members of Congress themselves. The Supreme Court has played a significant role in interpreting and upholding Congress's subpoena power, while also recognizing certain constraints, as seen in cases like Eastland v. U.S. Servicemen's Fund and Wilson v. United States.
| Characteristics | Values |
|---|---|
| Congressional attempts to obtain information | Courts will not interfere in valid attempts |
| Supreme Court's conclusion on subpoena power | Acts as a significant barrier to judicial interference |
| Challenge to the legitimacy of a subpoena | May proceed if it is not directed at Congress or its members |
| Enforcing a subpoena | Prosecution by the executive branch or a civil suit initiated by Congress |
| Non-compliance with a congressional subpoena | Cannot be justified on the ground of acting under the orders of a superior |
| Compliance with a House subpoena | Witness in violation has been allowed to comply before the issuance of an indictment |
| Contempt | An individual who fails or refuses to comply with a House subpoena may be cited for contempt of Congress |
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What You'll Learn
- The Supreme Court ruled in 1975 that the Constitution acts as a barrier to judicial interference in Congress's subpoena power
- Congress has no explicit constitutional power to investigate
- The Speech or Debate Clause suggests that enforcing a subpoena directed at a member of Congress raises constitutional issues
- Congress can subpoena members and coerce compliance through legislative penalties
- Noncompliance with a congressional subpoena by government officials cannot be justified by superior orders

The Supreme Court ruled in 1975 that the Constitution acts as a barrier to judicial interference in Congress's subpoena power
The subpoena power of Congress is a significant component of the US Constitution, allowing for the investigation and gathering of information. The Constitution acts as a safeguard for Congress's subpoena authority, as ruled by the Supreme Court in 1975. In the case of Eastland v. US Servicemen's Fund, the Supreme Court determined that the Constitution poses a substantial barrier to judicial interference in Congress's subpoena power.
The Eastland case involved a private non-profit organisation suing the Chairman of a Senate subcommittee. The non-profit sought to prevent a congressional subpoena issued to a bank from disclosing its account information. The subpoena was part of an investigation into alleged "subversive" activities by the organisation that were harmful to the US military. The Supreme Court held that the power to investigate, coupled with the ability to do so through compulsory processes, is a crucial aspect of the legislative process.
The ruling established that the Constitution protects Congress's ability to issue subpoenas and conduct investigations without judicial obstruction. This decision upholds the separation of powers between the legislative and judicial branches, ensuring Congress's investigative autonomy. However, it is important to note that this restraint exercised by the courts is not absolute. As Justice Thurgood Marshall concurred in Eastland, the Clause "does not entirely immunise a congressional subpoena from challenge."
While the Supreme Court's ruling sets a precedent for the constitutional protection of Congress's subpoena power, it does not make Congress's authority in this regard absolute. The ruling does not prevent challenges to the legitimacy of a subpoena as long as they are not directed at Congress or its members. This distinction allows for a balance between Congress's investigative powers and the potential for judicial review to ensure the proper use of those powers.
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Congress has no explicit constitutional power to investigate
The US Constitution does not explicitly grant Congress the power to investigate. However, this power has been interpreted as being "inherent and implied" in the Constitution, as it is necessary for Congress to effectively carry out its legislative functions. This power to investigate is tied to Congress's authority to legislate, and it allows Congress to gather information, oversee federal departments and executive agencies, and decide on appropriate legislation.
The first congressional investigation took place in 1792 when the House of Representatives formed a committee to investigate the defeat of General Arthur St. Clair in the Battle of the Wabash in the Northwest Territory (now Ohio). This investigation was justified as being "in aid of its legislative function," and it set a precedent for Congress's authority to conduct investigations.
While Congress's power to investigate is broad, it is not unlimited. The doctrine of separation of powers restricts Congress from investigating matters that are purely within the purview of the executive or judicial branches of government. For example, Congress cannot investigate an individual's entitlement to a pardon, as the Constitution grants pardon power solely to the President. Additionally, Congress cannot investigate the purely private affairs of ordinary citizens.
The Supreme Court has generally refrained from intervening in congressional investigations, especially when they involve government officials rather than private citizens. In the 1957 case of Watkins v. United States, the Supreme Court acknowledged Congress's historical role in performing an "informing function" to inquire into and publicize corruption, maladministration, or inefficiency in government agencies. However, the Court has also clarified that congressional subpoenas are not entirely immune from challenge and can be subjected to constitutional objections.
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The Speech or Debate Clause suggests that enforcing a subpoena directed at a member of Congress raises constitutional issues
The Speech or Debate Clause, as outlined in Article I, Section 6, Clause 1 of the US Constitution, has been interpreted by the Supreme Court as protecting "the independence and integrity of the legislature" and reinforcing the separation of powers. The Clause states that:
> The Senators and Representatives ... shall in all Cases, except Treason, Felony and Breach of the Peace, be privileged from Arrest during their Attendance at the Session of their respective Houses, and in going to and returning from the same; and for any Speech or Debate in either House, they shall not be questioned in any other Place.
The Clause has been interpreted to immunize senators and representatives from criminal or civil liability for "legislative acts" and to provide evidentiary and testimonial privileges. This means that members of Congress cannot be prosecuted by the executive branch or sued by Congress for legislative acts, and they are also protected from compelled testimony on protected acts.
However, the Clause does not shield "political" activities, even if they are "legitimate" official acts. The Supreme Court has also clarified that the Clause does not entirely immunize a congressional subpoena from challenge but requires that a Member "may not be called upon to defend a subpoena against constitutional objection". This suggests that a challenge to the legitimacy of a subpoena may proceed if it is not directed at Congress or its members.
In the case of Eastland v. U.S. Servicemen's Fund, the Supreme Court concluded that the Clause acts as a significant barrier to judicial interference in Congress's exercise of its subpoena power. However, the Court also noted that the Clause should be construed broadly to effectuate its purposes, and that its central purpose is to provide independence to Congress. This interpretation has given rise to some ambiguity in the precise scope of the protections afforded by the Clause.
In summary, the Speech or Debate Clause suggests that enforcing a subpoena directed at a member of Congress raises constitutional issues, particularly regarding the independence of the legislature and the separation of powers. However, the specific circumstances and nature of the underlying actions in question would determine the applicability of the Clause.
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Congress can subpoena members and coerce compliance through legislative penalties
The Constitution does not explicitly grant Congress the power to subpoena members, but it has been interpreted to have this power as an inherent part of its legislative authority. In the case of Eastland v. U.S. Servicemen's Fund, the Supreme Court concluded that the Constitution's Speech or Debate Clause acts as a significant barrier to judicial interference in Congress's exercise of its subpoena power. This case involved a suit filed by a private non-profit organization against the Chairman of a Senate subcommittee, seeking to enjoin a congressional subpoena issued to a bank for the non-profit's account information as part of an investigation into alleged "subversive" activities harmful to the US military.
However, Justice Thurgood Marshall's concurrence in Eastland suggests that the restraint exercised by the courts in deference to the separation of powers is not absolute. He clarified that the Clause "does not entirely immunize a congressional subpoena from challenge" but requires that a Member "may not be called upon to defend a subpoena against constitutional objection". This implies that a challenge to the legitimacy of a subpoena may proceed if it is not directed at Congress or its members.
The potential consequences of non-compliance with a congressional subpoena are serious. An individual who fails or refuses to comply with a House subpoena may be cited for contempt of Congress. While the Constitution does not expressly grant Congress the power to punish witnesses for contempt, this power has been deemed an inherent attribute of its legislative authority (as seen in Anderson v. Dunn). In addition, noncompliance with a congressional subpoena by government officials may not be justified on the ground that they were acting under the orders of a superior (United States v. Tobin, 195 F. Supp. 588 (D.D.C. 1961)).
Congressional committees can subpoena members and seek to coerce their compliance through legislative penalties, such as committee stripping or monetary fines. This allows committees to make their subpoenas more effective while avoiding the constitutional and practical concerns of litigating the subpoenas in the courts. However, it is important to note that the Jan. 6 committee investigating the attack on the US Capitol and efforts to overturn the 2020 presidential election has faced criticism for lacking institutional safeguards to prevent its powers from being deployed toward partisan ends.
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Noncompliance with a congressional subpoena by government officials cannot be justified by superior orders
The US Constitution does not explicitly grant Congress investigatory powers. However, the Supreme Court affirmed Congress's investigatory powers in a ruling about a century ago. The Court justified this power by stating that Congress requires information to execute its constitutional duties. Therefore, Congress can investigate any subject that falls within its legislative functions.
Congress has three options for enforcing compliance with a congressional subpoena:
- Congress can use its inherent contempt powers to detain the individual until they comply with the subpoena. However, this power is limited to cases where Congress acts within its legislative jurisdiction.
- Congress can refer the case to the United States Attorney's Office in the Department of Justice (DOJ). If prosecuted and convicted, the individual can be fined between $100 and $1,000 and imprisoned for one to twelve months. It is important to note that the DOJ has the discretion to prosecute and is not obligated to do so.
- Congress can seek judicial enforcement by filing a suit in the district court to compel the individual to comply with the subpoena.
While the courts generally refrain from interfering with valid congressional subpoenas, Justice Thurgood Marshall's concurrence in Eastland v. U.S. Servicemen's Fund suggests that this restraint is not absolute. He clarified that a congressional subpoena is not entirely immune from challenge and that a Member "may not be called upon to defend a subpoena against constitutional objection." This implies that a challenge to the legitimacy of a subpoena may proceed if it is not directed at Congress or its Members.
In conclusion, noncompliance with a congressional subpoena by government officials cannot be justified by superior orders. The Supreme Court has upheld Congress's investigatory powers, and Congress has multiple avenues to enforce compliance with subpoenas. While the courts generally respect the separation of powers, they have also indicated that congressional subpoenas can be challenged on constitutional grounds. Therefore, government officials cannot rely on superior orders as a valid justification for noncompliance with a congressional subpoena.
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Frequently asked questions
The Constitution's Speech or Debate Clause grants Congress subpoena power, allowing it to investigate and gather information.
Yes, a House subpoena can be challenged on constitutional grounds, as it does not provide absolute immunity from challenge. However, the challenge cannot be directed at Congress or its members.
Non-compliance with a House subpoena can result in being held in contempt of Congress. While there is no express constitutional power to punish witnesses for contempt, it is considered an inherent power of Congress.
While there is no explicit constitutional power for a House committee to subpoena its members, it is possible. The Speech or Debate Clause suggests that enforcing such a subpoena would raise constitutional issues, but it is not entirely clear.

























