One of the problems we face with 'illegal' immigration is the fact that their offspring, if born in the US, have access to run for the presidency without every pledging to support and abide by the US Constitution. This was exactly the fear our founding fathers had and why they required only natural born US. citizens can have access to run for the presidency.
If we are really serious about Immigration, we must support a new constitutional amendment (the American Birthright Amendment, ABA) that will once again establish an Art. II, §1, cl. 4 natural born Citizen as a person born of two U.S. Citizens.