illegal immigrants drive down wages in low skill jobs which depresses wages up the chain because natives have to find more skilled jobs to retain their previous standard of living.
At the same time their children, whether "dreamers" or native born get free education and healthcare the average cost per student in the US is around 15k the highest in the world, which these kids receive for free despite their parents never paying into the system.
The end result is that illegal immigration costs US federal and state governments 85-100 billion a year.
I support highly skilled labor ie top .1% of worldwide talent, not unlimited immigration sponsored by corporations to drive down wages for US citizens, whether that be low skilled manufacturing or software engineering
http://www.politifact.com/truth-o-meter/statements/2016/sep/...
https://fairus.org/issue/publications-resources/fiscal-burde...