Trump may cave on the Mexican tariffs: from deep within his lizard brain might come the realization that he is jumping the shark, and needs to pull back to protect himself. But, then again, he might not cave, at least not at once.
If Trump insists on going forward with supply-chain-disrupting tariffs, he will well and truly piss off the plutocrats. See, for example, this statement from that bastion of plutocracy, the United States Chamber of Commerce.
Just as humans need air, water, and nourishment to survive, so also Republican congressman needs (1) the votes of the yahoos and (2) the monetary support of the plutocracy. If Trump persists with his Mexican tariffs, and if he persists In threatening Republicans who oppose them, then the latter may have to choose between their two sources of life-sustaining nourishment: the plutocrats’ money and the the yahoos’ votes.
The Mexican tariff standoff is the first time, I believe, when Mitch McConnell and the rest of his merry band have faced so dire a dilemma.
How will they choose?
Some, perhaps, will go with Trump and the yahoos. But most of these folks are in it for the money. If you have Trump and his yahoo voters on your side, but lose access to the money, that kind of defeats the point of the whole exercise.