What we can do is build a fake wall, then we hire mexican mimes who pretend they can't get through it.
Another solution could be:
They are now bringing drugs to the addicts, but isn't it easier to take the addicts to the drugs?
So we bring the addicts to Mexico, which saves a lot of logistical hassle. No more addicts, no more drug traffic, no need for a wall.
The addicts can buy directly from the producer, so they pay less and the producer can charge more because the middlemen are eliminated.
And eliminating is something they do all the time anyway, so less murder cases.
I know, I'm a genius...

If someone wants to run for president and use my ideas. Fine.
I have a few business ideas and need your influence and cooperation.