Watch the embedded video where he lies flat out that they didn't discuss the issue.
http://www.politico.com/story/2016/08/who-will-pay-for-mexico-wall-trump-nieto-227607
Fully backed up, from his own lips.
If that's still insufficient for you jambo the only thing that comes to mind is the old adage:
"There are none so blind as those who will not see."
