Isn't the President of Mexico deeply unpopular and corrupt?
Indeed. I have a friend who is Mexcian and he has nothing but horrible things to say about EPN, and his opinions of him are generally reflective of the country at large.
Someone suggested this was a ploy by EPN to lay into Trump and improve his popularity. Trump is hated in Mexico.
I could believe that. Peña Nieto needs all the help he can get, his approval rating is at something like 30%. Of course, I also believe he is fully capable of messing this up, based on what I've heard about him.