In June 2017, when President Trump Donald John TrumpObama calls on Senate not to fill Ginsburg's vacancy until after election Planned Parenthood: 'The fate of our rights' depends on Ginsburg replacement Progressive group to spend M in ad campaign on Supreme Court vacancy MORE was asked if he would agree to testify under oath before Robert Mueller Robert (Bob) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout MORE and his special counsel team, his answer was yes, “100 percent.”

In the near future, Trump will indeed be questioned by Mueller and his team about the unfolding investigation. He will almost certainly be questioned about Russia, obstruction of justice and financial matters under investigation. He will probably be questioned under oath, though whatever the terms of the questioning, it would be a federal crime to lie to investigators.

On Wednesday, when Trump was asked again if he would agree to testify, he reneged on his promise to testify with 100 percent certainty and waffled. In recent days, Trump has said, falsely, that everyone knows there was no collusion between his campaign and Russia, which remains under investigation.

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He has said, falsely, that it was Hillary Clinton Hillary Diane Rodham ClintonWhat Senate Republicans have said about election-year Supreme Court vacancies Bipartisan praise pours in after Ginsburg's death Trump carries on with rally, unaware of Ginsburg's death MORE who colluded with Russia. He has said, falsely, that the Mueller investigation is a witch hunt. He has said, falsely, that it might not be necessary for him to testify. He has said, falsely, that the investigations are a plot by Democrats.

In the end, Trump will be questioned by Mueller. Either Trump and Mueller will agree on the terms of the questioning or, if Trump refuses to be questioned, he will be compelled to answer questions under subpoena.

When Trump is questioned by Mueller, they will share a rendezvous with destiny with potentially ominous consequences for the president, the nation and the world.

To avoid a disaster of historic proportion, when Trump answers questions from Mueller, he will have to change his lifetime pattern of behavior and tell the truth, the whole truth and nothing but the truth.

As the rendezvous with destiny approaches, because of the incalculable stakes involved for the president and the enormous risks this creates for him, America has entered a period of maximum danger in which Trump could precipitate a constitutional crisis by taking extreme actions that many Americans fear he will attempt.

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The key point as Mueller's meeting with Trump approaches is that the special counsel has access to extraordinary information that will inform his questions to the president, and Trump will not know what that information is when he answers the questions.

Trump will not know what former associates, who have copped a plea bargain, will have told the prosecutors, but Mueller will. Trump will not know whether any other plea bargains have been reached or any other indictments have been issued, but Mueller will.

Trump will not know whether crucial information about the Russian attack against American democracy, which may or may not involve collusion or financial dealings with Trump associates, has been provided by law enforcement and intelligence agencies of friendly democratic nations, but Mueller will.

Trump will not know whether Mueller has benefitted from a "Deep Throat" source who has provided crucial inside information about Russia, but Mueller will.

Last May, I wrote here that the Feds may have “Trump tapes” of discussions between Trump associates and Russians, which could be explosive. When he is questioned by Mueller, Trump will not know whether such evidence exists. Trump attorneys, Trump associates and Trump himself are all probably enduring sleepless nights worrying about this possibility. They should.

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Ultimately Mueller’s findings about the role of Trump on the matters under investigation could be the best thing that ever happened to Trump — or the worst.

The erratic behavior of Trump about all things Russia and the incendiary attacks against Mueller and the FBI by some of his GOP allies in Congress do not suggest they have high confidence of a favorable outcome when Trump meets Mueller in their rendezvous with destiny.

Brent 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 U.S. House of Representatives. He holds an LLM in international financial law from the London School of Economics.