And how many American workers work for companies founded by immigrants or the children of immigrants? Or work on projects and inventions that are the brainchild of immigrants? The job market is not a zero sum game. The US has 5% of the world population but is responsible for a very disproportionate amount of the world's technological output because it attracts a disproportionate fraction of inventors and engineers from all over the world. Why do you think the most immigrant rich cities in America like SF and NYC also have the highest incomes? If immigrants drove wages down and stole jobs from Americans, you would expect places like rural West Virginia to have higher incomes than SF. Spoiler: they don't.

If you have 1 million jobs held by Americans and 1 million jobs held by immigrants, and you kick out the 1 million immigrants, you do not get 2 million jobs held by Americans. You get 500k jobs held by Americans and 1.5 million extra jobs in China, India, the EU, and other any other regions that are less keen on punching themselves in the face with self-destructive industrial policy.