Robert Jordan wrote about this very move in his Wheel of Time series. In the second book, The Great Hunt, al-Lan Mandragoran teaches his student Rand al-Thor the move called "sheathing the blade."

In the book, Jordan writes:

"There will come a time when you must achieve a goal at all costs. It may come in attack or defense. And the only way will be to allow the sword to be sheathed in your own body. You will know when it comes, sheephearder, when the price is worth the gain, and there is no other choice left to you. That is called Sheathing the Sword. Remember it."

With this analogy in mind, the only way Trump would be arrested would be if he sheathed the blade in his own body so to speak. He would have to openly sacrifice himself and make himself a martyr of sorts, allowing himself to be arrested, which would definitely be a winning move for him, and a losing move for the Democrats. The Democrats are dumb enough to take this bait too.