Charlie Reed is right...but an aside...
The way this country is set up, illegal immigrants do take up resources that cost money, and through not paying taxes, the bills are all put on actual tax payers. Illegal immigrants, being untaxed, typically take undocumented jobs and, typically, make less than they deserve, from someone who is exploiting both them and the system.
Illegal immigrants are people who have rights, but the system is not made to support them, so the system should be changed, which is the point of this. Get off your teams and approach this objectively.