We've known for 40 years that the borders aren't secure, I guess that's a "growing consensus".
If we don't demonstrably control the border before giving amnesty, almost overnight we will have 20 million illegal Mexicans instead of 12 million.
From all reports I've heard that 20 million will blossom to over 100 million in fairly short order with their birthrate, chain migration and increased illegal border crossers. We're seeing a policy of national suicide being created right before our very eyes.