"If you ask Americans whether they've been successful at sealing the border with Mexico, they'll tell you that it's a very difficult proposition."

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Diseases don't respect borders. You know, just at the edge of the American border, that isn't the edge of diseases. We need to be sure that we're looking worldwide. And it is in our security interest, as well as our moral interest, to pay attention to the rest of the world.

— Laura Bush