I am of the opinion that deporting them would actually hurt our economy, keeping them in the US will actually strengthen our economy.
I had a very smart Asian electrical engineer I knew who got his degree from the University of Chicago make this very good point to me 20+ years ago. Mexico is actually doing us a favor not accepting them back.
My engineering friend made me aware that we actually have an economy that is very dependent on our low cost of goods dependent on illegal Mexican labor, this is how we make a lot of our money. A lot of food in the supermarket would be so much more expensive were it not for illegals. They take low paying jobs and dangerous jobs that Americans are unwilling to take. You want a great way to hurt our US economy? Send all illegal Mexicans living in America back to Mexico, congrats you just made everything so much more expensive for everyone.
...and eventually they will become US citizens adding to our workforce. More labor to do jobs. Mexicans are some of the hardest working people on the face of this earth. So why would you be stupid enough to send your best workers back to Mexico?