Because smart immigrants might make money and vote Republican. From noted right-wing source Bloomberg.
http://www.aol.com/article/2014/12/...id7|htmlws-main-bb|dl30|sec1_lnk2&pLid=574811
http://www.aol.com/article/2014/12/...id7|htmlws-main-bb|dl30|sec1_lnk2&pLid=574811