I don't think you can effectively secure the border, you just need to eliminate the cheese on the other side. Also, it already has been shown that being pro-immigration does not translate to votes. These people are voting democrat no matter what.
Herbert Camacho '16
"Every age has its peculiar folly: Some scheme, project, or fantasy into which it plunges, spurred on by the love of gain, the necessity of excitement, or the force of imitation." - Charles Mackay Extraordinary Popular Delusions and the Madness of Crowds