[H]owever busy or essential a presidential aide might be, and whatever their proximity to sensitive domestic and national-security projects, the Pres… - Ketanji Brown Jackson

[W]hen a committee of Congress seeks testimony and records by issuing a valid subpoena in the context of a duly authorized investigation, it has the Constitution’s blessing, and ultimately, it is acting not in its own interest, but for the benefit of the People of the United States. If there is fraud or abuse or waste or corruption in the federal government, it is the constitutional duty of Congress to find the facts and, as necessary, take corrective action.

In short, America has traditionally relied on the law to keep its Presidents in line. Starting today, however, Americans must rely on the courts to determine when (if at all) the criminal laws that their representatives have enacted to promote individual and collective security will operate as speedbumps to Presidential action or reaction. Once self-regulating, the Rule of Law now becomes the rule of judges, with courts pronouncing which crimes committed by a President have to be let go and which can be redressed as impermissible. So, ultimately, this Court itself will decide whether the law will be any barrier to whatever course of criminality emanates from the Oval Office in the future. The potential for great harm to American institutions and Americans themselves is obvious.

[W]hen DOJ insists that Presidents can lawfully prevent their senior-level aides from responding to compelled congressional process and that neither the federal courts nor Congress has the power to do anything about it, DOJ promotes a conception of separation-of-powers principles that gets these constitutional commands exactly backwards. In reality, it is a core tenet of this Nation’s founding that the powers of a monarch must be split between the branches of the government to prevent tyranny.