I actually have a hunch for what's going to happen when the border's built.
First, Annoying Orange is going to have a private construction company handle the wall construction. The construction company is going to use that 13 billion dollars and build in lazy mode, paying workers less than they deserve and paying pennies for the actual wall itself. The rest of the 6 billion dollars remaining will go directly to the CEOs of this private company, who will in turn, donate a massive portion of it to various republicans who voted for the wall's construction.
This way, half of that taxpayer wall money will be legally given to these white house representatives without it looking like embezzlement.
Keep telling yourself that
uh, okay. It's pretty true. Concrete typically costs $40 per square foot, while steel fencing costs $20
They also would be much less secure but hey, it's all about the money. When you share a border with a terrorist state I'd say it's a safe bet to have a physical wall that can stop heavy vehicles from smashing right through. What exactly can a fence stop? A child? Anyone who doesn't have bolt cutters/ladder? Ben Carson?
I edited my post a little bit after that point. I realized a little bit in that the wall would definitely be necessary in their case since they're in the middle of a war with a neighboring state.
Unlike Isreal, however, the mexican border isn't a potential warzone. And before you ask, fence we have can definitely stop a vehicle. Also our fence can't be cut with bolt cutters, although both a fence and a concrete wall can be scaled with a ladder.