Job theft I always thought to be a weak reason.

What about the cost of illegal immigrants on healthcare, education, jails, courts, and community services?

For those who think we should legalize the illegal immigrants, isn't that unfair to the thousands who lawfully wait in line to enter legally? My uncle went through the legal process, it's pretty unfair that others can just unlawfully enter, hide from the law, then be given amnesty.

But that argument only matters if you support annual limits on legal immigration, a whole nuther can of worms