Border walls do work.
Homeland Security secretary: Border walls work. Yuma sector proves it.
https://www.usatoday.com/story/opinion/2017/08/22/homeland-security-secretary-border-walls-work-yuma-sector-proves-it-elaine-duke-column/586853001/
https://www.usatoday.com/story/opinion/2017/08/22/homeland-security-secretary-border-walls-work-yuma-sector-proves-it-elaine-duke-column/586853001/