He'd probably say that those walls were built by Romans in different times. We get it Frank, unfortunately Trumps "wall" if ever built is to keep the bad guys at bay and though I may not be as radical as Mr Trump, attention to the borders of my country is of importance to many citizens like myself. This American Catholic say thank you for your interest but its an American issue.
...^^^ I agree, its nothing the Pope fully understands, not when He is in the most fortified of Public Sight Seer Venues.... Build Bridges??? Ya' gotta' be kidding me, not when the Mexican's/Cartel's et al.; have been building tunnels, the link is there, or - Cartel Connection has already created a spider web system for Distribution across our Nation's Highways, Air Routes, boat routes, tunnel to truck routes...... its one of running meth, cocaine, heroin both under ground and above, no need to build a bridge, when a more vast connection has more than 'bridged' and harmed the US......and I have no problem with a Berlin Wall on the MX Border....