Just as a small side note (since I've seen this posted before and even then it didn't sound quite right so I looked it up...):
Even back in 2003 Mexico's GDP was around $700 bln, currently close to $1200 bln. That '30% of GDP' claim was just silly.
OK, carry on then...
Perhaps Tancredo misremembered what he was told. But I have accurately reported the quote that was in the article. I report, you decide.
In any event, I don't think it materially changes the main issue (and well known fact) that Mexico actively encourages its citizens to illegally move to the US.