This is a very narrow understanding of national security. The impact of millions of undereducated, unassimilating people is just as much a threat to our national security, considering their cultural and economic impact, as that of violent terrorists. Perhaps worse, in the long run.
This is a weapon of modern warfare. The people bomb. Very effective against a more powerful foe in a PC world.
The Muslims have used it very well around the world for years and the Mexicans have caught on.
You just flood the target country with your own people who do not assimilate but retain their national identity and remake the target country into their own.
A political correct superpower's army is effectively neutered. Especially one who is controlled by the business leaders of the country and who lust for all that cheap labor and increased profits.
Don't be fooled as we have been before.
If they want to stop it they'll take some type of physical action at the border.
If they don't want to, they will just talk a lot, have some meetings and pass some meaningless legislation that they have no intention of enforcing just so they can get through another election cycle.
We are so gullible.