wall to scale. it's got a lot of assets. the problem is, tell them, what do you think about the importance of see-through. >> whiff a see-through wall, sir, i know what's approaching the border before it approaches. we have great partners in mexico with the law enforcement on that side. i can call them for assistance. i don't get the opportunity to get ahead of a threat if i can't see what's approaching. >> and what's the danger of not having the see-through? >> the steel/metal fence behind us, we learned from that. in the '90s, we went in cut in ports so we could see. we found that smugglers were using the fence to hide behind. and they were acquiring large groups of people and narcotics and then just rush across the border. >> if you have a pure fence, that's a fence, a very sturdy fence. but coming up, the first thing i notice, look how many holes are in that fence. they fix the holes, but it doesn't look very go ahead. they patch it with more fence. if you take a look at the fence and it's a very powerful fence, not doing the trick, because they cut holes in it. and then they're patching holes