I am perfectly aware of the fact that the investigation by special counsel Robert S. Mueller III of President Donald J. Trump has not been completed.

No final report has been filed, and no indictments have yet been issued.

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But after stating this, I have no doubt that Donald J. Trump will “do a Nixon.” By that, I mean, he will repeat what the former president did when it appeared that he would be either criminally charged or forced to leave office.

The Saturday night massacre took place when that era’s special prosecutor, Archibald Cox, was ready to take action against the incumbent president.

Nixon told then-Attorney General Elliot Richardson to fire Cox. Richardson refused and resigned.

Next in line was William Ruckelshaus, Richardson’s deputy attorney general. He refused and resigned, too.

Finally, Robert Bork, who was solicitor general and next in line, assumed the position of acting attorney general and did the dirty deed.

The New York Times reported on Tuesday that prosecutors have told former Trump campaign manager Paul J. Manafort that they plan to indict him. This planned indictment is based on phone taps placed on Manafort. These "intercepts" began even before Manafort was Trump's campaign manager.

In addition, in July, federal agents with a search warrant picked the lock on the front door of Manafort’s home and seized important documents.

Obviously, Mueller means business and is acting quickly and aggressively to put pressure on those he believes can provide essential information in his investigation.

Some observers have called Mueller's tactics "shock and awe."

Manafort will soon be confronted with a critical personal decision. Does he continue to proclaim his innocence and say he did nothing wrong, or does he tell all and incriminate Trump and others?

Manafort, I'm quite sure, does not want to go to prison. If the evidence is overwhelming and credible, and if he believes Mueller has “the goods on him,” he undoubtedly will take the only avenue which keeps him out of prison and keeps his life from being ruined.

Subpoenas are being issued, a grand jury has been impanelled, and witnesses are being called to appear. This "wide-ranging" investigation is definitely heating up and advancing.

One major, crucial point, however:

Trump has publicly said the Mueller investigation should just focus on his campaign.

Trump said in a New York Times interview that Mueller would be "overstepping his boundaries" if he investigated anything to do with his or his family's financial dealings that were unrelated to the campaign investigation.

That is exactly the rub.

I believe Trump knows that if Mueller goes into that area, he is in for real trouble. Not only might he have to leave office, but the embarrassing or possible criminal evidence could lead to the eventual demise of his financial well-being and empire.

Here is my central point.

Does anyone believe that, faced with such an impending doom, Trump would accept his fate? Would act differently than Nixon?

He believed Attorney General Jeff Sessions Jefferson (Jeff) Beauregard SessionsGOP set to release controversial Biden report Trump's policies on refugees are as simple as ABCs Ocasio-Cortez, Velázquez call for convention to decide Puerto Rico status MORE would end any investigation. When Sessions recused himself, Trump knew he didn't have a protector. He was banking on Sessions to put an end to all his troubles.

This is the same individual who fired FBI Director James Comey. Comey had just begun his investigation. In fact, in a meeting in the Oval Office, Trump stated that he did this to relieve "great pressure." He was referring to the Russia investigation.

Trump will not hesitate to instruct Mueller's supervisor, Deputy Attorney General Rod Rosenstein, to fire Mueller. If Rosenstein refuses, as Elliot Richardson did, then Trump will go down the chain of command at the Justice Department until he finds someone who will. He will find another Robert Bork.

Donald Trump Donald John TrumpBiden leads Trump by 36 points nationally among Latinos: poll Trump dismisses climate change role in fires, says Newsom needs to manage forest better Jimmy Kimmel hits Trump for rallies while hosting Emmy Awards MORE will defend this action by saying that Mueller was on a "fishing expedition" or a "witch hunt" and "overstepped his authority."

His base will wildly support him.

The country will face a constitutional crisis.

Do you think Trump cares or would be concerned?

Trump will not go quietly — will not give in or give up.

Let us all prepare for this scenario. It is not fantasy, and it will become a brutal reality.

Mark Plotkin is a contributor to the BBC on American politics and a columnist for The Georgetowner. He previously worked as a political analyst for WAMU-FM, Washington’s NPR affiliate, and for WTOP-FM, Washington’s all-news radio station. He is a winner of the Edward R. Murrow Award for excellence in writing.