Why do career politicians  like Chin always begin with the God-like presumption Americans must prove a right to preserve our identity as the world's first People to be defined by our common principles?  Unlike the Liberal's Mosaic that defines a People by their bloodline?
In this case, Chin presumes it's his right to demand America prove to him why there's a need to control our borders. But isn't it his obligation to prove to us why we don't?  Seriously, America isn't short of people or talent, is it?  And, aside from 1%-ers who lust for the profit desperately cheap (especially illegal) immigrant labor offers, most agree a smaller population would solve many problems
So seriously Mr. Chin. How do you defend your claim our borders should remain open to people from Islamic Theocracies whose clerics clearly declare that State only exists to enforce Church Law?  When a fundamental pillar of Western Civilization, and America, is the belief that a Separation of Church and State is necessary?