A good article on that from the New York Post:
https://nypost.com/2018/01/13/we-already-have-a-border-wall-and-it-works/
I think we need it. We definitely need to enhance border security. The wall is one way, and we should add other measures as well.
I’m ashamed I’ve never seen the wall in El Paso. When they built a wall near us it was substandard and scalable but it slowed down traffic considerably. They just went west to places with no fence.