Satirists are mostly flummoxed by Trump, because there's no absurdity they can dream up that is more absurd than the evil orange turd itself, and that is not out-trumped by some yet more appalling and improbable excrescence oozing from its tiny bitter orifices. Armando Iannucci does, however, make a pretty good stab at the problem in this letter to Trump. He accurately captures the essence of Trump's underlying modus operandi thus:

"They used to tease you about your attitude to the truth, didn’t they? All your post-reality fictoid-facts, like how global warming was a myth invented by the Chinese, how you respected all women without exception, except the greedy, grasping, ugly ones who were trying to suck you dry, how Obama wasn’t born in America, and also how you put everyone right when you said he was.

And that rigged election: you had evidence the election was rigged against you and you were going to lose, and then, when you won it fair and square, you had proof you would have won it even more fairly and squarely had it not been rigged against you so you couldn’t win so bigly. And now they say the Russians rigged the election, and you say the election wasn’t rigged, it was never rigged, and you’ve been saying for months: it was never rigged."

Logic fails in the face of contradiction, and fails badly. If both A and not-A are true, the moon is (logically) made of green cheese. If you can persuade people to believe both the thing and its contradiction, then the consequences are dire. As Iannucci puts it:

"You’ve taught people to believe not what is empirically true but what is emotionally true, which is a better truth. You’ve set free the credulity of the people."

This is how most religions work too, as it happens.