Missing in the TV coverage of the immigration rallies I've seen so far is the primary issues that's motivating people to attend them: families. I've written this before but it deserves repeating. Plenty of people here perfectly legally have parents, siblings, spouses (contrary to popular perception marrying a foreigner and jumping through the appropriate legal hoops is actually quite difficult), and even children who are undocumented.
Demands to deport millions of people are demands to break up families and send people to back to a "home" they may have never known.