I guess Donald Trump was eager to counter the impression in Michael Wolff’s book that he is irascible, mentally small and possibly insane. On Tuesday, he allowed a bipartisan session in the White House about immigration to be televised for nearly an hour.

Surely, he thought that he would be able to demonstrate to the world his lucidity and acumen, his grasp of the issues and his relish for rapprochement with his political adversaries.

But instead what came through was the image of a man who had absolutely no idea what he was talking about; a man who says things that are 180 degrees from the things he has said before; a man who has no clear line of reasoning; a man who is clearly out of his depth and willing to do and say anything to please the people in front of him.

He demonstrated once again that he is a man without principle, interested only in how good he can make himself look and how much money he can make.

Yes, he has an intrinsic hostility to people who are not white, particularly when they challenge him, but as a matter of policy, the whole idea of building a wall for which Mexico would pay was just a cheap campaign stunt to, once again, please the people in front of him.

Trump is not committed to that wall on principle. He is committed only to looking good as a result of whatever comes of it. Mexico is never going to pay for it, and he knows it. He has always known it. That was just another lie. Someone must have stuck the phrases “chain migration” and “diversity lottery” into his brain — easy buzzwords, you see — and he can now rail against those ideas for applause lines.

But he is completely malleable on actual immigration policy. He doesn’t have the stamina for that much reading. Learning about immigration would require reading more words than would fit on a television news chyron.

If Donald Trump follows through with what he said during that meeting, his base will once again be betrayed. He will have proved once again that he was saying anything to keep them angry, even telling lies. He will have demonstrated once again his incompetence and unfitness.

That is because Trump is man-as-message, man-as-messiah. Trump support isn’t philosophical but theological.

Trumpism is a religion founded on patriarchy and white supremacy.

It is the belief that even the least qualified man is a better choice than the most qualified woman and a belief that the most vile, anti-intellectual, scandal-plagued simpleton of a white man is sufficient to follow in the presidential footsteps of the best educated, most eloquent, most affable black man.

As President Lyndon B. Johnson said in the 1960s to a young Bill Moyers: “If you can convince the lowest white man he’s better than the best colored man, he won’t notice you’re picking his pocket. Hell, give him somebody to look down on, and he’ll empty his pockets for you.”

Trump’s supporters are saying to us, screaming to us, that although he may be the “lowest white man,” he is still better than Barack Obama, the “best colored man.”

In a way, Donald Trump represents white people’s right to be wrong and still be right. He is the embodiment of the unassailability of white power and white privilege.

To abandon him is to give up on the pact that America has made with its white citizens from the beginning: The government will help to underwrite white safety and success, even at the expense of other people in this country, whether they be Native Americans, African-Americans or new immigrants.

But this idea of elevating the lowest white man over those more qualified or deserving didn’t begin with Johnson’s articulation and won’t end with Trump’s manifestation. This is woven into the fabric of the flag.

As I have written here before, when Alabama called a constitutional convention in 1901, Emmet O’Neal, who later became governor, argued that the state should “lay deep and strong and permanent in the fundamental law of the state the foundation of white supremacy forever in Alabama,” and as part of that strategy he argued:

“I don’t believe it is good policy to go up in the hills and tell them that Booker Washington or Councill or anybody else is allowed to vote because they are educated. The minute you do that every white man who is not educated is disfranchised on the same proposition.”

In his essay “Black Reconstruction in America, 1860-1880,” W.E.B. Du Bois discussed why poor whites didn’t make common cause with poor blacks and slaves but instead prized their roles as overseers and slave catchers, eagerly joining the Klan. This fed the white man’s “vanity because it associated him with the masters,” Du Bois wrote.

He continued:

“Slavery bred in the poor white a dislike of Negro toil of all sorts. He never regarded himself as a laborer, or as part of any labor movement. If he had any ambition at all it was to become a planter and to own ‘niggers.’ To these Negroes he transferred all the dislike and hatred which he had for the whole slave system. The result was that the system was held stable and intact by the poor white.”

For white supremacy to be made perfect, the lowest white man must be exalted above those who are black.

No matter how much of an embarrassment and a failure Trump proves to be, his exploits must be judged a success. He must be deemed a correction to Barack Obama and a superior choice to Hillary Clinton. White supremacy demands it. Patriarchy demands it. Trump’s supporters demand it.