To round off the Mexico question, I understand what you're saying, Dr. Bow. Would it be, based on constitutional and other issues, unrealistic or impossible for Mexico to be a partner in NORAD, even if it were desirable? Perhaps you could answer both of those questions: is it not even conceivable, or is it something that, if it were possible, would be useful, and has it ever been proposed?
On October 30th, 2014. See this statement in context.