Deportation or genocide is the obvious answer. Every country has some form of affordable housing, most of which are at maximum capacity because of illegals. Less illegals means cheaper homes.
The current crop of immigrants are the perfect illustration of the difference between "Immigrants built this country" and "Immigrants come to a country that's already built".
None of them build houses. They drive Ubers, or work as PSWs, or minimum effort retail.
How is that going to solve any problems?
> Solve problems?