There is already something in place acting as a barrier to try to help keep illegals out, so the idea is certainly not new, and in fact, twenty two years ago Clinton got a standing ovation for speaking about taking more aggressive measures to keep illegals out, and deporting them when necessary etc etc ad nauseum, so what has really changed? Oh, besides the fact that you probably have over twenty million more illegals in your country since then... Would you support just allowing what is already in place to just fall into complete disrepair to the point of total uselessness?
Then we wouldn't need a wall.