What is executive privilege? Why a new Justice Department memo could make presidents harder to investigate

A new Justice Department opinion on executive privilege is raising fresh questions about how far a US president can go in shielding advisers and private communications from congressional or legal scrutiny.

The debate centres on a recent memo from the Justice Department's Office of Legal Counsel, or OLC, which argues that certain private individuals who advise the president may be able to invoke executive privilege when faced with subpoenas.

Critics say that interpretation could make it more difficult for Congress and the courts to obtain testimony about a president's actions, particularly during investigations into possible misconduct.


Supporters of broad presidential confidentiality, however, have long argued that presidents need protected space to receive candid advice and carry out their constitutional responsibilities.

The dispute now turns on a fundamental question: where should the line be drawn between protecting presidential decision-making and ensuring that the president remains accountable?

What exactly is executive privilege?

Executive privilege is the principle that allows a president and, in some circumstances, members of the executive branch to keep certain communications confidential.

The idea is rooted in the belief that presidents need to receive frank advice without every internal discussion automatically becoming public. Without some degree of confidentiality, advisers might be less willing to speak openly about sensitive policy, national security or legal matters.

But executive privilege is not explicitly defined as an unlimited power in the US Constitution.

Over time, presidents have asserted different forms of privilege, and courts have been asked to decide when those claims are valid. The result is that executive privilege has generally been treated as a qualified protection rather than an absolute shield.

A president cannot simply invoke the phrase and automatically prevent a court, Congress or investigators from obtaining every document or witness they seek.

Why the new Justice Department memo is attracting attention

The latest OLC memo takes the argument into more controversial territory by suggesting that private advisers who communicate with the president may also be protected from compelled testimony in certain circumstances.

That is significant because previous disputes over executive privilege have largely focused on presidents and government officials acting within the executive branch.

If the protection can be extended more broadly to people outside government, critics fear it could create a larger group of individuals capable of resisting subpoenas by claiming that their conversations with the president should remain confidential.

The practical effect could be delays or obstacles for congressional investigations.

Even when courts eventually reject a claim of privilege, the legal battle itself can consume months or years. By the time a witness is finally required to testify, the political investigation that prompted the subpoena may have lost momentum or ended altogether.

The Don McGahn case showed how long privilege fights can last

One of the most prominent recent examples involved Don McGahn, who served as White House counsel during Donald Trump's first administration.

In 2019, the House Judiciary Committee sought McGahn's testimony in connection with issues raised during special counsel Robert Mueller's investigation.

The Trump administration argued that McGahn was protected by a theory known as testimonial immunity and should not be compelled to appear before Congress.

The dispute moved through the courts and produced conflicting legal decisions before the parties eventually reached an agreement allowing McGahn to provide testimony behind closed doors.

The episode became an example of how a legal fight over presidential immunity or privilege can significantly delay an investigation, regardless of the eventual outcome.

Courts have repeatedly placed limits on presidential secrecy

American history contains several high-profile examples of presidents attempting to keep information from investigators.

Richard Nixon famously argued that presidential confidentiality should protect recordings made in the White House. In the landmark United States v Nixon case, however, the Supreme Court ruled that Nixon had to comply with a subpoena for the tapes.

The court recognised that confidential presidential communications could deserve protection, but concluded that executive privilege was not absolute.

Other presidents have also faced limits. Bill Clinton unsuccessfully attempted to use claims of presidential immunity and confidentiality in legal disputes, while earlier conflicts involving Thomas Jefferson helped establish that presidential interests could still be weighed against the need for evidence in judicial proceedings.

The broader lesson from those cases is that presidential confidentiality has historically faced limits when it conflicts with compelling legal or investigative interests.

Could private presidential advisers now avoid subpoenas?

That is the question at the centre of the current controversy.

The OLC memo's reasoning could potentially give private individuals who advise a president a stronger basis for challenging demands for testimony or documents.

Critics argue that this would be particularly concerning if presidents increasingly rely on informal advisers who do not hold official government positions.

Such a system could create an accountability gap, they warn. A president might receive sensitive advice from people outside the formal structure of government, while investigators could face additional legal barriers when attempting to examine those communications.

The issue is not necessarily whether private conversations with a president should ever be confidential. The more difficult question is whether that confidentiality should extend far enough to prevent witnesses from responding to subpoenas.

Why the timing of the memo matters

The new opinion has also generated political speculation because of the possibility that control of Congress could shift after future elections.

A change in the House or Senate could lead to new investigations of the administration, and congressional committees would likely seek testimony and documents from current and former officials, as well as other individuals close to the president.

A broader interpretation of executive privilege could become an important legal tool in those battles.

That does not mean the OLC memo itself settles the issue. Justice Department legal opinions can guide the executive branch, but courts ultimately retain the power to decide whether a particular privilege claim is legally valid when a dispute reaches litigation.

Executive privilege could face its biggest test outside the White House

The latest debate may ultimately force courts to confront a question that has become increasingly important in modern presidential politics: how much of a president's advisory network can remain beyond the reach of investigators?

Presidents have always relied on trusted confidants. But modern administrations often operate through a mixture of official staff, lawyers, political allies and informal advisers.

If executive privilege is extended further into that informal network, Congress could find it harder to establish who knew what and when during investigations into presidential conduct.

For critics, that risks weakening one of the main checks on executive power. For defenders of presidential confidentiality, restricting private advice too heavily could interfere with a president's ability to receive honest counsel.

The courts may eventually have to decide where the boundary lies.

Until then, the Justice Department memo has opened a new front in the long-running battle over presidential power — and over whether the people closest to a president can be compelled to explain what happened behind closed doors.