While it is usually unwise to predict a decision of the United States Supreme Court, here is a dramatic prediction about the great impeachment debate that grips the nation today.

In the coming months, probably sooner than analysts expect, the Supreme Court will uphold and affirm the unanimously decided case of U.S. v. Nixon and apply its guiding principle to critical pending legal cases and impeachment proceedings advancing in Congress.

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At this defining moment, President Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE will then be required to release critical evidence now being withheld and allow testimony from administration officials compelled by conscience, patriotism and respect for law to testify before Congress and courts.

Historic cases are moving at an expedited pace to the Court of Appeals level. The time is rapidly approaching for another definitive Supreme Court ruling on the great constitutional question of whether a president can aggressively and comprehensively claim privileges to systematically prevent critical witnesses and evidence of potential crimes and impeachable offenses from being presented to Congress and courts — which would effectively place President Trump above the law.

The coming Supreme Court decision will have such a momentous constitutional and practical influence that it will forever define the historic legacy and reputation of Chief Justice John Roberts and Associate Justices Brett Kavanaugh Brett Michael KavanaughTrump plans to pick Amy Coney Barrett to replace Ginsburg on court Collins trails challenger by 4 points in Maine Senate race: poll SCOTUS confirmation in the last month of a close election? Ugly MORE, Neil Gorsuch Neil GorsuchTrump plans to pick Amy Coney Barrett to replace Ginsburg on court Abortion stirs GOP tensions in Supreme Court fight Poll: 59 percent think president elected in November should name next Supreme Court justice MORE, Samuel Alito Samuel AlitoAbortion, gun rights, ObamaCare at stake with Supreme Court pick READ: Supreme Court justices mourn death of Ginsburg, 'an American hero' Ginsburg death sets up battle over future of court MORE, Clarence Thomas Clarence ThomasSCOTUS confirmation in the last month of a close election? Ugly GOP senator attacks Biden: 'I'm not sure what he recalls' Abortion, gun rights, ObamaCare at stake with Supreme Court pick MORE, Ruth Bader Ginsburg Ruth Bader GinsburgProgressive group buys domain name of Trump's No. 1 Supreme Court pick Democratic senator to party: 'A little message discipline wouldn't kill us' Lincoln Project mocks Lindsey Graham's fundraising lag with Sarah McLachlan-themed video MORE, Elena Kagan Elena KaganREAD: Supreme Court justices mourn death of Ginsburg, 'an American hero' Democrats, advocates seethe over Florida voting rights ruling Supreme Court denies push to add Green Party candidates to Montana ballot MORE, Sonia Sotomayor Sonia SotomayorToomey, swing state Republican, supports Senate moving on Trump Supreme Court nominee Names to watch as Trump picks Ginsburg replacement on Supreme Court READ: Supreme Court justices mourn death of Ginsburg, 'an American hero' MORE and Stephen BreyerStephen BreyerAppeals court revives House lawsuit against Trump border wall READ: Supreme Court justices mourn death of Ginsburg, 'an American hero' Ginsburg death sets up battle over future of court MORE.

The Supreme Court will either decide, as the justices unanimously decided in U.S. v. Nixon, that the president must allow relevant evidence and witnesses to be presented, or that U.S. v. Nixon was wrongly decided, and the president possesses unchallengeable unitary power to prevent critical evidence of potential crimes and impeachable offenses from being considered by Congress and courts.

The aggressive, sweeping and systematic efforts of the Trump administration to ignore subpoenas and prevent testimony of witnesses and production of evidence means the Supreme Court is being asked to effectively legalize obstruction of justice, abuse of power and destruction of evidence.

This aggressive and all-encompassing attempt to sabotage all investigations over many months has had the judicial impact, for which the president bears ALL responsibility, of pushing into election year one of the most profound and consequential constitutional decisions since John Marshall took the oath of office as chief justice.

Against this unprecedented presidential obstruction of evidence and sabotage of investigations, a growing list of widely admired and vastly respected administration insiders, motivated by a deep patriotism and alarmed by dangers to our national security, have been inspired to extraordinary profiles in courage at a critical moment in history by openly defying illegitimate orders to refuse to present evidence and testify before Congress.

When these enormously credible officials present their testimony in public to the country in nationally televised hearings, the effect on public opinion will be powerful and profound. Their credibility, stature, career courage, vast experience and patriotic passion will stand in decisive and dramatic contrast to the banana republic tactics employed by the president and his desperate supporters to slander and demean them by attacking their motives and patriotism.

The coverup is losing. The facts and truth are emerging. The persuasive and decisive evidence is mounting. A large majority of Americans want the investigation to proceed fully and fairly, unimpeded and unobstructed.

In U.S. v. Nixon a unanimous majority, understanding the enormity of the matter, ruled after expedited consideration that the Nixon coverup must end and the evidence must be expeditiously provided.

In my view, the Supreme Court will not, by a 5-4 party-line vote of Republican-appointed justices, find that the unanimous decision of U.S. v Nixon was wrongly decided.

It is far more likely that Chief Justice John Roberts, sitting where Chief Justice John Marshall once sat in the citadel of justice where the Nixon-era court once decided, will steer the court toward a broad historic decision declaring for time immemorial that no American is above the law — including President Trump.

Budowsky was an aide to former Sen. Lloyd Bentsen (D-Texas) and former Rep. Bill Alexander (D-Ark.), who was chief deputy majority whip of the House of Representatives. He holds an LLM in international financial law from the London School of Economics.