Speculation about Special Counsel Robert Mueller’s investigation has turned toward obstruction of justice—specifically, whether President Trump can be criminally prosecuted for firing James Comey as director of the Federal Bureau of Investigation or for earlier asking Mr. Comey to go easy on onetime national security adviser Mike Flynn. The answer is no. The Constitution forbids Congress to criminalize such conduct by a president, and applying existing statutes in such a manner would violate the separation of powers.
The Constitution creates three coequal branches of government, and no branch may exercise its authority in a manner that would negate or fundamentally undercut the power of another. The power to appoint and remove high-level executive-branch officers, such as the FBI director, is a core aspect of the president’s executive authority. It is the principal means by which a president disciplines the exercise of the executive power the Constitution vests in him.
The same is true of Mr. Trump’s request, as purported by Mr. Comey: “I hope you can see your way clear . . . to letting Flynn go.” The FBI director wields core presidential powers when conducting an investigation, and the president is entirely within his rights to inquire about, and to direct, such investigations. The director is free to ignore the president’s inquiries or directions and risk dismissal, or to resign if he believes the president is wrong. Such officials serve at the president’s pleasure and have no right to be free of such dilemmas.
A law criminalizing the president’s removal of an officer for a nefarious motive, or the application of a general law in that way, would be unconstitutional even if the president’s action interferes with a criminal investigation. Such a constraint would subject every exercise of presidential discretion to congressional sanction and judicial review. That would vitiate the executive branch’s coequal status and, when combined with Congress’s impeachment power, establish legislative supremacy—a result the Framers particularly feared.
Mr. Trump’s critics claim that subjecting the president’s actions to scrutiny as potential obstructions of justice is simply a matter of asking judges to do what they do every day in other contexts—determine the purpose or intent behind an action. That is also wrong. The president is not only an individual, but head of the executive branch. Separating his motives between public interests and personal ones—partisan, financial or otherwise—would require the courts to delve into matters that are inherently political. Under Supreme Court precedent stretching back to Marbury v. Madison (1803), the judiciary has no power to do so. And lawmakers enjoy an analogous immunity under the Speech and Debate Clause.
The president’s independence from the other branches does not merely support “energy” in the chief executive, as the Framers intended. It also ensures that he, and he alone, is politically accountable for his subordinates’ conduct. If officials as critical to the executive branch’s core functions as the FBI director could determine whom and how to investigate free from presidential supervision, they would wield the most awesome powers of government with no political accountability. History has demonstrated that even when subject to presidential authority, the FBI director can become a power unto himself—as J. Edgar Hoover was for decades, severely damaging civil liberties.
There are limits to presidential power. The Constitution requires the Senate’s consent for appointment of the highest-level executive-branch officers—a critical check on presidential power. The Supreme Court has upheld statutory limits—although never involving criminal sanction—on the removal of certain kinds of officials. But the decision to fire principal executive-branch officers like the FBI director remains within the president’s discretion. A sitting president can also be subjected to civil lawsuits—but only in a carefully circumscribed fashion, to avoid impeding his ability to discharge the powers of his office.
The ultimate check on presidential power is impeachment. Even though Mr. Trump cannot have violated criminal law in dismissing Mr. Comey, if a majority of representatives believe he acted improperly or corruptly, they are free to impeach him. If two-thirds of senators agree, they can remove him from office. Congress would then be politically accountable for its action. Such is the genius of our Constitution’s checks and balances.
None of this is to suggest the president has absolute immunity from criminal obstruction-of-justice laws. He simply cannot be prosecuted for an otherwise lawful exercise of his constitutional powers. The cases of Richard Nixon and Bill Clinton —the latter impeached, and the former nearly so, for obstruction of justice—have contributed to today’s confusion. These were not criminal charges but articulations of “high crimes and misdemeanors,” the constitutional standard for impeachment.
And in neither case was the accusation based on the president’s exercise of his lawful constitutional powers. If a president authorizes the bribery of a witness to suppress truthful testimony, as Nixon was accused of doing, he can be said to have obstructed justice. Likewise if a president asks a potential witness to commit perjury in a judicial action having nothing to do with the exercise of his office, as Mr. Clinton was accused of doing.
Although neither man could have been prosecuted while in office without his consent, either could have been after leaving office. That’s why President Ford pardoned Nixon—to avoid the spectacle and poisonous political atmosphere of a criminal trial. In Mr. Trump’s case, by contrast, the president exercised the power to fire an executive-branch official whom he may dismiss for any reason, good or bad, or for no reason at all. To construe that as a crime would unravel America’s entire constitutional structure.
Messrs. Rivkin and Casey practice appellate and constitutional law in Washington. They served in the White House Counsel’s office and Justice Department in the Reagan and George H.W. Bush administrations.