In my opinion that statement just makes him another tool of the Democrats.
Unrestrained human immigration IS the problem with tens of thousands crossing where there is no border wall. And while those people may only be looking for a better life, they will depend on the US government for support. The Democrats will make them into a permanent dependency class and future voters that will give them unrestricted power as far into the future that we can see.
I think the ports ought to be closed too until the Mexican guberment helps us catch these guys. Yes A know the Cartels control the guberment down there but enough pressure should help them change things.