Like that former Mexican president said, you can build a 20 foot wall, they're just going to come over it with a 20 foot ladder. Or as a lot do, just come under the wall through tunnels. You can build a 100 foot wall, it doesn't matter if they're just going under it. Or they'll continue to be smuggled across the border. Or they'll just come legally and overstay their VISAs. What Trump needs to do is acknowledge that illegal immigrants are going to get into America, and focus his resources and remove them when they do with stricter rules. Take that money you were going to use on a wall and offer cash rewards for tips leading to the deportation of illegals. Money is the greatest motivator behind sex, so if someone knows they can make money from anonymously reporting illegals, ICE is going to be VERY busy. Continue to go after businesses who employ illegals with heavy fines and sanctions. Make it so that if you're caught illegally living in America, you're deported and you are forever disqualified from ever legally immigrating or visiting America. And of course, DACA MUST be abolished.