Executive privilege is the power of the President of the United States and other members of the executive branch of the United States Government to resist certain subpoenas and other interventions by the legislative and judicial branches of government in pursuit of information or personnel relating to the executive. The power of Congress or the federal courts to obtain such information is not mentioned explicitly in the United States Constitution, nor is there any explicit mention in the Constitution of an executive privilege to resist such requests from Congress or courts. The Supreme Court of the United States has ruled this privilege may qualify as an element of the separation of powers doctrine, derived from the supremacy of the executive branch in its own area of Constitutional activity.
The Supreme Court confirmed the legitimacy of this doctrine in United States v. Nixon in the context of a subpoena emanating from the judiciary, instead of emanating from Congress. The Court held that there is a qualified privilege, which once invoked, creates a presumption of privilege, and the party seeking the documents must then make a "sufficient showing" that the "Presidential material" is "essential to the justice of the case". Chief Justice Warren Burger further stated that executive privilege would most effectively apply when the oversight of the executive would impair that branch's national security concerns. Regarding requests from Congress (instead of from the courts) for executive branch information, as of a 2014 study by the Congressional Research Service, only two federal court cases had addressed the merits of executive privilege in such a context, and neither of those cases reached the Supreme Court.
In addition to which branch of government is requesting the information, another characteristic of executive privilege is whether it involves a "presidential communications privilege" or instead a "deliberative process privilege" or some other type of privilege. The deliberative process privilege is often considered to be rooted in common law, whereas the presidential communications privilege is often considered to be rooted in separation of powers, thus making the deliberative process privilege less difficult to overcome. Generally speaking, presidents, congresses and courts have historically tended to sidestep open confrontations through compromise and mutual deference in view of previous practice and precedents regarding the exercise of executive privilege.
Deliberative process privilege is a specific instance of the more general principle of executive privilege. It is usually considered to be based upon common law rather than separation of powers, and its history traces back to the English crown privilege (now known as public-interest immunity). In contrast, the presidential communications privilege is another specific instance of executive privilege, usually considered as being based upon separation of powers, and for that reason it is more difficult to overcome than deliberative process privilege. A significant requirement of the presidential communications privilege is that it can only protect communications sent or received by the President or his immediate advisors, whereas the deliberative process privilege may extend further down the chain of command.
In the context of privilege assertions by US presidents, law professor Michael Dorf has written: "In 1796, President George Washington refused to comply with a request by the House of Representatives for documents related to the negotiation of the then-recently adopted Jay Treaty with the Kingdom of Great Britain. The Senate alone plays a role in the ratification of treaties, Washington reasoned, and therefore the House had no legitimate claim to the material. Therefore, Washington provided the documents to the Senate but not the House."
President Thomas Jefferson continued the precedent for this in the trial of Aaron Burr for treason in 1809. Burr asked the court to issue a subpoena duces tecum to compel Jefferson to testify or provide his private letters concerning Burr. Chief Justice John Marshall, a strong proponent of the powers of the federal government but also a political opponent of Jefferson, ruled that the Sixth Amendment to the Constitution, which allows for these sorts of court orders for criminal defendants, did not provide any exception for the president. As for Jefferson's claim that disclosure of the document would imperil public safety, Marshall held that the court, not the president, would be the judge of that. Jefferson refused to personally testify but provided selected letters.
In 1833, President Andrew Jackson cited executive privilege when Senator Henry Clay demanded he produce documents concerning statements the president made to his cabinet about the removal of federal deposits from the Second Bank of the United States during the Bank War.
During the period of 1947–49, several major security cases became known to Congress. There followed a series of investigations, culminating in the famous Hiss-Chambers case of 1948. At that point, the Truman Administration issued a sweeping secrecy order blocking congressional efforts from FBI and other executive data on security problems. Security files were moved to the White House and Administration officials were banned from testifying before Congress on security related matters. Investigation of the State Department and other cases was stymied and the matter left unresolved.
During the Army–McCarthy hearings in 1954, Eisenhower used the claim of executive privilege to forbid the "provision of any data about internal conversations, meetings, or written communication among staffers, with no exception to topics or people." Department of Defense employees were also instructed not to testify on any such conversations or produce any such documents or reproductions. This was done to refuse the McCarthy Committee subpoenas of transcripts of monitored telephone calls from Army officials, as well as information on meetings between Eisenhower officials relating to the hearings. This was done in the form of a letter from Eisenhower to the Department of Defense and an accompanying memo from Eisenhower Justice. The reasoning behind the order was that there was a need for "candid" exchanges among executive employees in giving "advice" to one another. In the end, Eisenhower would invoke the claim 44 times between 1955 and 1960.
The Supreme Court addressed "executive privilege" in United States v. Nixon, the 1974 case involving the demand by Watergate special prosecutor Archibald Cox that President Richard Nixon produce the audiotapes of conversations he and his colleagues had in the Oval Office of the White House in connection with criminal charges being brought against members of the Nixon Administration. Nixon invoked the privilege and refused to produce any records.
The Supreme Court did not reject the claim of privilege out of hand; it noted, in fact, "the valid need for protection of communications between high Government officials and those who advise and assist them in the performance of their manifold duties" and that "[h]uman experience teaches that those who expect public dissemination of their remarks may well temper candor with a concern for appearances and for their own interests to the detriment of the decisionmaking process." This is very similar to the logic that the Court had used in establishing an "executive immunity" defense for high office-holders charged with violating citizens' constitutional rights in the course of performing their duties. The Supreme Court stated: "To read the Article II powers of the President as providing an absolute privilege as against a subpoena essential to enforcement of criminal statutes on no more than a generalized claim of the public interest in confidentiality of nonmilitary and nondiplomatic discussions would upset the constitutional balance of 'a workable government' and gravely impair the role of the courts under Article III." Because Nixon had asserted only a generalized need for confidentiality, the Court held that the larger public interest in obtaining the truth in the context of a criminal prosecution took precedence.
"Once executive privilege is asserted, coequal branches of the Government are set on a collision course. The Judiciary is forced into the difficult task of balancing the need for information in a judicial proceeding and the Executive's Article II prerogatives. This inquiry places courts in the awkward position of evaluating the Executive's claims of confidentiality and autonomy, and pushes to the fore difficult questions of separation of powers and checks and balances. These 'occasion[s] for constitutional confrontation between the two branches' are likely to be avoided whenever possible. United States v. Nixon, supra, at 692."
In November 1982, President Ronald Reagan signed a directive regarding congressional requests for information. Reagan wrote that if Congress seeks information potentially subject to executive privilege, then executive branch officials should "request the congressional body to hold its request in abeyance" until the president decides whether to invoke the privilege. 
Prior to becoming Attorney General in 1991, Deputy Attorney General William P. Barr issued guidance in 1989 about responding to congressional requests for confidential executive branch information. He wrote: "Only when the accommodation process fails to resolve a dispute and a subpoena is issued does it become necessary for the president to consider asserting executive privilege".
The Clinton administration invoked executive privilege on fourteen occasions.
In 1998, President Bill Clinton became the first president since Nixon to assert executive privilege and lose in court, when a federal judge ruled that Clinton aides could be called to testify in the Lewinsky scandal.
Later, Clinton exercised a form of negotiated executive privilege when he agreed to testify before the grand jury called by Independent Counsel Kenneth Starr only after negotiating the terms under which he would appear. Declaring that "absolutely no one is above the law", Starr said such a privilege "must give way" and evidence "must be turned over" to prosecutors if it is relevant to an investigation.
The Bush administration invoked executive privilege on six occasions.
President George W. Bush first asserted executive privilege in December 2001 to deny disclosure of details regarding former Attorney General Janet Reno, the scandal involving Federal Bureau of Investigation (FBI) misuse of organized crime informants James J. Bulger and Stephen Flemmi, and Justice Department deliberations about President Bill Clinton's fundraising tactics.
Bush invoked executive privilege "in substance" in refusing to disclose the details of Vice President Dick Cheney's meetings with energy executives, which was not appealed by the GAO. In a separate Supreme Court decision in 2004, however, Justice Anthony Kennedy noted "Executive privilege is an extraordinary assertion of power 'not to be lightly invoked.'" United States v. Reynolds, 345 U.S. 1, 7 (1953).
Further, on June 28, 2007, Bush invoked executive privilege in response to congressional subpoenas requesting documents from former presidential counsel Harriet Miers and former political director Sara Taylor, citing that:
The reason for these distinctions rests upon a bedrock presidential prerogative: for the President to perform his constitutional duties, it is imperative that he receive candid and unfettered advice and that free and open discussions and deliberations occur among his advisors and between those advisors and others within and outside the Executive Branch.
On July 9, 2007, Bush again invoked executive privilege to block a congressional subpoena requiring the testimonies of Taylor and Miers. Furthermore, White House Counsel Fred F. Fielding refused to comply with a deadline set by the chairman of the Senate Judiciary Committee to explain its privilege claim, prove that the president personally invoked it, and provide logs of which documents were being withheld. On July 25, 2007, the House Judiciary Committee voted to cite Miers and White House Chief of Staff Joshua Bolten for contempt of Congress.
On July 13, less than a week after claiming executive privilege for Miers and Taylor, Fielding effectively claimed the privilege again, this time in relation to documents related to the 2004 death of Army Ranger Pat Tillman. In a letter to the House Committee on Oversight and Government Reform, Fielding claimed certain papers relating to discussion of the friendly fire shooting "implicate Executive Branch confidentiality interests" and would therefore not be turned over to the committee.
On August 1, 2007, Bush invoked the privilege for the fourth time in little over a month, this time rejecting a subpoena for Karl Rove. The subpoena would have required Rove to testify before the Senate Judiciary Committee in a probe over fired federal prosecutors. In a letter to Senate Judiciary Chairman Patrick Leahy, Fielding claimed that "Rove, as an immediate presidential advisor, is immune from compelled congressional testimony about matters that arose during his tenure and that relate to his official duties in that capacity."
Leahy claimed that President Bush was not involved with the decision to terminate the service of U.S. attorneys. Furthermore, he asserted that the president's executive privilege claims protecting both Bolten and Rove were illegal. The Senator demanded that Bolten, Rove, Sara Taylor, and J. Scott Jennings comply "immediately" with their subpoenas. This development paved the way for a Senate panel vote on whether to advance the citations to the full Senate. "It is obvious that the reasons given for these firings were contrived as part of a cover-up and that the stonewalling by the White House is part and parcel of that same effort", Leahy concluded.
As of July 17, 2008, Rove still claimed executive privilege to avoid a congressional subpoena. Rove's lawyer wrote that his client is "constitutionally immune from compelled congressional testimony."
On June 20, 2012, President Barack Obama asserted executive privilege in order to withhold certain Department of Justice documents related to the Operation Fast and Furious controversy ahead of a United States House Committee on Oversight and Government Reform vote to hold Attorney General Eric Holder in contempt of Congress for refusing to produce the documents. Later the same day, the House Committee voted 23–17 along party lines to hold Holder in contempt of Congress over not releasing the documents.
Executive privilege was also used in a lawsuit stemming from the 2012 implementation of the "Net Worth Sweep" against Fannie Mae and Freddie Mac. The Obama administration did not disclose roughly 11,000 documents from the plaintiffs in the discovery process as they related to the reasoning behind the 2012 actions.
Leaders of the U.S. Securities and Exchange Commission (SEC) testified on February 4, 2009 before the United States House Committee on Financial Services subcommittee. The subject of the hearings was why the SEC had failed to act when Harry Markopolos, a private fraud investigator from Boston, alerted the SEC, detailing his persistent and unsuccessful efforts to get the SEC to investigate Bernard Madoff beginning in 1999. One official claimed executive privilege in declining to answer some questions.
While investigating Russian interference in the 2016 election, the Senate Intelligence Committee subpoenaed former FBI Director James Comey to testify. Comey was fired several weeks before being subpoenaed but had appeared before the committee once before in March while still serving as director. Less than a week before the scheduled hearing, it was reported that President Trump was considering invoking executive privilege to prevent Comey's testimony. According to attorney Page Pate, it seemed unlikely that executive privilege would be applicable, as Trump had publicly spoken about the encounters in question multiple times.
Sarah Huckabee Sanders, a White House spokesman, released a statement on June 5 stating: "The president's power to assert executive privilege is very well-established. However, in order to facilitate a swift and thorough examination of the facts sought by the Senate Intelligence Committee, President Trump will not assert executive privilege regarding James Comey's scheduled testimony."
Also in June 2017, other officials in the Trump administration, including Dan Coats and Jeff Sessions, declined to describe in congressional hearings conversations they had with President Trump, on the ground that they wanted Trump to have an opportunity to decide whether to invoke executive privilege. According to Robert S. Litt, former general counsel of the Office of the Director of National Intelligence in the Obama administration, this argument may be legitimate under the presidential communications privilege:
[T]he privilege belongs to the President, and inferior officers should not take it upon themselves to disclose such communications without express permission from the White House. Certainly that is how these issues were handled in the Obama Administration: when Congress asked an agency for information about presidential communications, as it often did, the agency consulted with the White House to see if there were objections to responding.
Democratic members of Congress emphasized that they were not seeking classified information, and strongly objected to the rationale given by the Trump administration officials.
On February 15, 2018, Steve Bannon, the former Trump political adviser, but who was no longer part of the Trump administration, appeared at the House Intelligence Committee under subpoena. According to committee members, he answered only 25 questions that had been pre-approved by the White House, in each to which he answered "no", and invoked the president's executive privilege in declining to answer any of the committee questions. Republican and Democratic members of the committee said they were considering seeking contempt of Congress charges.