[Kazan]

This guy has been paid off by Republican business interests and is helping them import cheap labor?

[x]

Or maybe he has concerns about the expense and effectiveness of the wall.

If he's wrong, he's wrong. Tell him, but all the name-calling going on isn't going to convince anybody.

I doubt his super-high-tech system of drones and sensors will be more effective than walls or barriers -- any border security system is going to involve a variety of different methods reinforcing each other and backing each other up -- but people can disagree without ridiculing or vilifying those who think differently.