Stop wasting a so much time, money, and energy worrying about the ones who are already here. Some are decent people who are well trained at their jobs and we're back to a labor shortage again. Secure the border (we don't need a wall for that), put in some decent immigration reform, leave a path to citizenship for the people who are already here. The bad apples will bring plenty of attention to themselves and we can deal with them instead of wasting our resources to hunt down every undocumented immigrant.