Yes I have.
This is a copypasta I made a long time ago to post in case I needed sources to defend myself.
I think the majority of the literature in economics is showing immigrants, including those with the lowest skills/are illegal, tend to increase wages. This is because they shift outwards demand more by providing labor/services natives lack, hence why immigrants tend to have skill sets at the top or bottom.
It is also true that immigrants have a negative effect, because by increasing the supply of labor, the may decrease labor prices overall, thus resulting for lower pay for natives. This is especially alarming, as most immigrants (including those who are illegal) tend to have low skills, and thus drag downwards the pay of similarly unskilled natives, who are arguably those most in need of greater pay.
I think though that the most recent papers tend to show that the benefits outweights the negatives.
http://www.hamiltonproject.org/asset...migration3.pdf
http://www.nber.org/papers/w21123
And most economists tend to agree that low skilled immigration does have a positive effect in the economy.
http://www.igmchicago.org/igm-econom...vuNnqkBeAMAfHv
Some recent papers even argue that with open borders that global poeverty would be obliterated
http://www.ssc.wisc.edu/~jkennan/res...penBorders.pdf
As for the crime, illegal immigrants tend to commit 1/5 of crimes than natives:
http://www.ssc.wisc.edu/~jkennan/res...penBorders.pdf
And the immigration process is screwed for the US:
http://www.openlawlab.com/wp-content...lon-Reason.jpg
Now even if the wages were to drop Borjas, the most pessimistic economist here doesn't even find this effect to be greater than about 5%.
https://cmuinsider.com/2016/02/22/an...-donald-trump/
Those can be overcomed with a net safety program or through a small tax to the immigrants.
Uff that took me a while.
Conclusion: Low skilled immigrants do benefit the US and you are wrong