"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
"Border Patrol agents say they can’t be much clearer: They want more walls along the U.S.-Mexico border. ... The NBPC’s survey, of more than 600 agents in two of the Border Patrol’s busiest sectors, found ... A stunning 89 percent of line agents say a “wall system in strategic locations is necessary to securing the border.” Just 7 percent disagreed."
https://www.washingtontimes.com/news/2018/apr/2/border-patrol-agents-back-trump-wall-survey-finds/