Which "skilled high paying jobs " you talking about? Very few Citizens want these low pay and low opportunity jobs anyway.
I have friends and relatives living in Chicago and Las Vegas, Building Contractors and have to go to other parts of USA like Montana or Alaska cause they can't compete on bidding of jobs due to other contractors using cheaper labor, and cheaper labor does come at a cost called lack of experience, knowledge of building standards and stealing what is not installed. These jobs are seriously not low paying for carpentry, plumbing, steel, welding, masonry. Down here I been to jobsites where workers are wearing masks cause they belong to gangs of illegals. Stud uprights put in not 18 inches centered but wherever they will fit. Some never put down black felt for roofing or it is spotty where inspectors might crawl up two stories, but lack of building inspectors come for 5 minutes/off to next site. Contractors haul in wiring as they never can leave copper wiring on a site. You would think in Vegas it be easy to get a electrical job, think again and learn Spanish.
Twenty years in West Texas use to have 15,000 illegals capture each day, El Paso wall was built for 30 miles and border patrol agent sits every 3 blocks along the wall and catch about 100. It not only Mexicans coming across, our enemies from desert regions, many Chinese now(they usually come through from Canada) bit these others are very small percentage. ICE and Border Patrol still capture a trailers loaded with illegals every year in region, not ever truck gets inspected and illegals are crammed between pallets as high tech xray machines used on every truck and yet they still get through.
What was just a border problem has become a National problem.
Good, competition is the foundation of capitalism.
You know what would be great, Mexican family of 26 move into 3 bedroom house next to you, listening to same music 18 hours a day, you wonder why you now have cockroaches everywhere in your home, cars coming over all hours of day and night, yea doesn't this sound very nice. What was once your home and quiet place to be has been invaded by your "foundation of capitalism". YEAH baby.