As I have mentioned before, any wall, barrier, fortification, or even a single strand of cotton string, is useless and a waste of everyone’s time and money if it doesn’t have men with guns guarding it who are authorized to use deadly force, and are unencumbered with a political rules-of-engagement handbook.
We have the leverage to stop this, but it requires the US to punish Mexico economically. Heavily tax all remittances to Mexico - at least a 50% tax. Impose tariffs on all goods imported from Mexico to match the costs of illegal immigration - and make these tariffs ‘flexible’ depending upon Mexico stopping border crossings from their side.
One thing is very clear. What the left is saying about having ‘surveillance’ and electronics/technology instead of a wall is hogwash, because even when we know where and when there are going to be crossings they happen anyway. We need a big physical barrier. Also, instead of rewarding people with amnesty, we should make it the law that 1. If you cross illegally you can never ever become a US citizen. 2. If you cross illegally, and have a baby here, that child does not have automatic citizenship.