Because they know it won't change anything. If we were serious about stopping it we would go after those who employ them. This isn't serious, it's just a scapegoat for problems we have.
Tunnels anyone?
Israel targets Hezbollah border tunnels
The GOP establishment wants the illegals to come it for the cheap labor, for their donors.
They don't want it, because they fear it WILL change everything.
Have you not been paying attention?
Yes I have been paying attention. The same people holding down wages will continue to with or without immigrants. Our country is filled with monopolies. If anyone was serious about getting rid of immigrants we would go after those who employ them. We are not, nor is trump. Hence the wall idea.
Immigrants give employers a large supply of labor. That drives down prices, ie wages.
And yes, we should be going after employers. I've heard some of that being done. I don't know how much is being done, because the lib media would not report it, if it was happening.