Overpopulation is another issue?

I supposed it could be construed that it's inter-connected with the immigration issue as in my OP because of certain sections of the population now here who persist in having more children than they can support, the offspring of whom then go on to perpetuate that way of life?

Anyway, we're no nearer proposing a new "way" of considering new immigrants coming here or how to track down the million or so illegals currently here already or even what to do with them if they are found?