Diana West speculates here (h/t JW)

At home, the line of defense is clear. It is our border. My new strategy calls on us to think of our border as more than just a line on a map. We need to see the border as a cultural line also, a defining line of freedom against proponents of sharia, which, I cannot emphasize enough, poses a direct threat to our founding principles of liberty and equality. It is that simple. There is a crucial military component to the anti-sharia defensive, which I will outline momentarily. But without taking civil precautions at the border, even a decisive military victory abroad could be nullified by non-violent means at home.

How? Through largely unregulated immigration of peoples from "sharia states" -- those regions whose governing traditions derive, wholly or in some important part, from the edicts of Islam. If such an influx continues, Islamic law will be accommodated, adopted and even legislated, at least in some jurisdictions, according to majority will. We know this to be true because such a "sharia shift" is already transforming what sociologists call post-Christian Europe into an increasingly Islamic sphere. If we do not want to see such changes here, we must act. Accordingly, I am asking Congress to amend our laws to bar further Islamic immigration, beginning with immigration from sharia states. This, the most crucial domestic component of my anti-sharia program, will undoubtedly be regarded as the most controversial because it necessitates making a definitive judgment against the laws promulgated by Islam, a religion. This may appear to go against our cherished tradition of religious tolerance, not to mention good manners. But if the laws promulgated by Islam directly threaten freedom of conscience, freedom of expression and religion, women's rights and key concepts of equality -- and they do -- it is a sign of intellectual rigor mortis not to say so. And I do say so, but, again, not to launch a transformative military or cultural offensive against Islam, but to initiate the mobilization of a defensive movement to prevent the Islamization of American law and liberty....