"But what we're talking about is we're talking about a wall in strategic locations. We're not talking about a great wall of the United States. We're not talking about a continuous wall from California down to Texas. We're talking about a wall in strategic locations which then helps the Border Patrol agents do their job better."
https://www.npr.org/2017/01/26/511745401/head-of-border-patrol-union-on-trumps-wall-plans