excuse me... what law that Congress passed enacted chain migration? What law allows sanctuary cities? what law granted illegals DACA? YOU are part of the problem.
"The Immigration and Nationality Act Amendments of 1965 (the Hart-Celler Act) abolished the system of national-origin quotas. There was, for the first time, a limitation on Western Hemisphere immigration (120,000 per year), with the Eastern Hemisphere limited to 170,000. The law changed the preference system for immigrants. Specifically, the law provided preference to immigrants with skills needed in the U.S. workforce, refugees and asylum seekers, as well as family members of U.S. citizens. Family reunification became the cornerstone of the bill. At the time, the then-chairman of the Senate Immigration Subcommittee Edward Kennedy remarked that "the bill will not flood our cities with immigrants. It will not upset the ethnic mix of our society. It will not relax the standards of admission. It will not cause American workers to lose their jobs." (U.S. Senate, Subcommittee on Immigration and Naturalization of the Committee on the Judiciary, Washington, D.C., Feb. 10, 1965. pp. 1–3.)"
https://en.wikipedia.org/wiki/History_of_laws_concerning_immigration_and_naturalization_in_the_United_States
Sanctuary cities is not a federal law. It is laws passed by individual cities, counties, states. You do not know that?
It is the family based preference in immigration law which allows a new immigrant (not yet US citizen, that takes 5 years of waiting without crime) to sponsor brothers, sisters, uncles, aunts, nephews, nieces, cousins, brothers-in-laws, etc. The NY city terrorist who attacked people with a truck sponsored 22 relatives! No test required for skills, education, wealth or English ability.