I’ve long said that if they wanted to actually stop illegal immigration, stop focusing most of your energy on arresting the immigrants and go after their employers hard. Nail every employer at any scale who uses them to the wall with fines and jail time. The practice will all but stop and almost no one will come illegally anymore because you have to make money to live in this country. It will cost far less long run and will make migrants start funneling through the legal immigration. Then make legal immigration easier so people are paying taxes and contributing to a society that desperately needs more labor. (Not saying they are only targeting illegal immigration here, just stating generally)