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.
Gold Medal Recipient: Jimmy Rustling (2014)
“They have the guns and therefore we are for peace and for reformation through the ballot. When we have the guns then it will be through the bullet.” - Saul Alinsky, quoting Lenin