variety obstruction-of-justice issues. Other events we investigated, however, drew upon the President’s Article II authority, which raised constitutional issues that we address in Volume II, Section III.B, infra. A factual analysis of that conduct would have to take into account both that the President’s acts were facially lawful and that his position as head of the Executive Branch provides him with unique and powerful means of influencing official proceedings, subordinate officers, and potential witnesses. Second, many obstruction cases involve the attempted or actual cover-up of an underlying crime. Personal criminal conduct can furnish strong evidence that the individual had an improper obstructive purpose, see, e.g., United States v. Willoughby, 860 F.2d 15, 24 (2d Cir. 1988), or that he contemplated an effect on an official proceeding, see, e.g., United States v. Binday, 804 F.3d 558, 591 (2d Cir. 2015). But proof of such a crime is not an element of an obstruction offense. See United States v. Greer, 872 F.3d 790, 798 (6th Cir. 2017) (stating, in applying the obstruction sentencing guideline, that “obstruction of a criminal investigation is punishable even if the prosecution is ultimately unsuccessful or even if the investigation ultimately reveals no underlying crime”). Obstruction of justice can be motivated by a desire to protect non-criminal personal interests, to protect against investigations where underlying criminal liability falls into a gray area, or to avoid personal embarrassment. The injury to the integrity of the justice system is the same regardless of whether a person committed an underlying wrong. In this investigation, the evidence does not establish that the President was involved in an underlying crime related to Russian election interference. But the evidence does point to a range of other possible personal motives animating the President’s conduct. These include concerns that continued investigation would call into question the legitimacy of his election and potential uncertainty about whether certain events—such as advance notice of WikiLeaks’s release of hacked information or the June 9, 2016 meeting between senior campaign officials and Russians—could be seen as criminal activity by the President, his campaign, or his family. Third, many of the President’s acts directed at witnesses, including discouragement of cooperation with the government and suggestions of possible future pardons, occurred in public view. While it may be more difficult to establish that public-facing acts were motivated by a corrupt intent, the President’s power to influence actions, persons, and events is enhanced by his