A year ago there were 11,000 border guards patrolling the 2,000 mile Mexican border. That's a ratio of 5.5 guards per mile. And the anti-illegals still call that an "open border". If 5.5 is "open border", 6 isn't going to be "sealed border."
And even if you reduced the cost, you still have the ability of 50 million per year jumping the border. (Plus the majority of illegals now who enter legally and stay after they become illegal).
"Sealing the border" is a political scam. Even if it were possible, we would never do it. But Congress will add a token number of guards and build a few fences just to make the anti-illegals feel better. Like most social issues, it's all symbolism.
Potent words!
"Even if it were possible, we would never do it."
"Like most social issues, it's all symbolism."
Now the fact that you are willing to promote the existence of legislators who perform symbolisms tells me that witch doctors are permitted in your area of reasoning also.
Myself, I hire people who deal with facts and only facts. I don't promote or vote for legislators who want symbolisms.