Not in the millions and not without tightly controlled restrictions. Perry has just promised a free pass to citizenship to lawbreakers that shouldn't be here in the first place. To HELL with that.
That is YOUR comprehension of the matter.
I am combing the archives of some Mexican Spanish language press for stuff on this, and already I have found some rather potent stuff (originally in Spanish, it will have to be rendered into English... a little bit is old, like 2006, but that is fine, it may portend to show original positions on hot issues, at least as perceived in the Mexican press). Stay tuned.