My opinion has been that it's good for US workers if foreigners immigrate and become citizens, because even if they make less than most Americans, they make more than they did in their prior country, which means they are improving the global market for labor, from the point of view of workers.

But having classes of people who live in the country but have special restricted rights and never become full citizens worries me.

I wish we could move away from the idea that citizenship is a reward for following the rules and instead consider that making people citizens is a benefit for (maybe even vital to preserving) society.