My more cynical side says secret the meeting went like this:
Trump: You know I'm not really running for president. It's a big scam.
Nieto: Sí
Trump: I'm here to offer you a deal from the incoming Clinton administration to expand NAFTA and help polish your reputation with the Mexican people.
Nieto: ¡Muy Bueno!
Trump: OK, now we have to face the press. Do you have the Clinton approved notes she email to you?
Nieto: ¡Aquí, Amigo!