The entire reason that the U.S. has Federal immigration laws as opposed to State immigration laws - which existed at the time of the Revolution - was to maintain a high standard for immigrants since the States had agreed to have no internal passports and thus open borders within the Union.
They didnt want one state letting anyone in and thus allowing bad actors into all the States.
Europe did not think through the Schengen agreement this way, and the nations of Europe probably would not agree to EU control of their borders anyway. It’s just a multilateral agreement.
And it is where the United States are going (notice I used “are” rather then “is”) if the flood into the Southwest continues unabated.
Breaking the Bonds of Our Union indeed, Mr. Clinton, you disgusting pig.
Clinton, the two Bushes and Obama - worse than all three combined.