The Supreme Court continued in relevant part: In Fitzgerald, for instance, the Court concluded that a former President is entitled to absolute immunity from “damages liability for acts within the ‘outer perimeter’ of his official responsibility.” Id., at 756. The Court’s “dominant concern” was to avoid “diversion of the Presi dent’s attention during the decision-making process caused by needless worry as to the possibility of damages actions stemming from any particular official decision.” Clinton v. Jones, 520 U. S. 681, 694, n. 19.
By contrast, when prosecutors have sought evidence from the President, the Court has consistently rejected Presidential claims of absolute immunity. During the treason trial of former Vice President Aaron Burr, for instance, Chief Justice Marshall rejected President Thomas Jefferson’s claim that the President could not be subjected to a subpoena. Marshall simultaneously recognized, however, the existence of a “privilege” to withhold certain “official papers.” United States v. Burr, 25 F. Cas. 187, 192 (No. 14,694) (CC Va.). And when a subpoena issued to President Richard Nixon, the Court rejected his claim of “absolute privilege.” United States v. Nixon, 418 U. S. 683, 703. But recognizing “the public interest in candid, objective, and even blunt or harsh opinions in Presidential decision-making,” it held that a “presumptive privilege” protects Presidential communications. Id., at 708. Because that privilege “relates to the effective discharge of a President’s powers,” id., at 711, the Court deemed it “fundamental to the operation of Government and inextricably rooted in the separation of powers under the Constitution.” Id., at 708.
Criminally prosecuting a President for official conduct undoubtedly poses a far greater threat of intrusion on the authority and functions of the Executive Branch than simply seeking evidence in his possession. The danger is greater than what led the Court to recognize absolute Presidential immunity from civil damages liability—that the President would be chilled from taking the “bold and unhesitating action” required of an independent Executive. Fitzgerald, 457 U. S., at 745. Although the President might be exposed to fewer criminal prosecutions than civil damages suits, the threat of trial, judgment, and imprisonment is a far greater deterrent and plainly more likely to distort Presidential decision-making than the potential payment of civil damages. The hesitation to execute the duties of his office fearlessly and fairly that might result when a President is making decisions under “a pall of potential prosecution,” McDonnell v. United States, 579 U. S. 550, 575, raises “unique risks to the effective functioning of government,” Fitzgerald, 457 U. S., at 751.
The phrase “conclusive and preclusive authority” is used through the Court’s opinion. Conclusive authority refers to the general power to decide. Preclusive authority refers to the power to prevent something from happening.
