Build the wall.
All of the wall.
Now.
SO what is your answer to the question? Do we invade mexico and build the wall on their side, cutting them off from the river? Do we build an impassable wall on our side of the river, cutting off our people, along with all the animals that require the water, from the river?
Or do you think we’ll build an impassable wall right down the middle of the river, creating two rivers separated by concrete?