BS.
If the Mexican is legally living in the US, then they do not need a Mexican ID, as they will have LEGITIMATE US ID.
The "matricula consular" is an "illegal-alien ID card", because only illegal aliens need it, and that is why the Mexican Government created it.
It's already accepted by many US cities.
In a couple of years, I predict states will start accepting it, if they haven't already.
By the end of the decade, there will be a federal law requiring it's acceptance.
Welcome to the New World Order brought to you by George Clinton, William Jefferson Bush, Bob Gore, and Al Dole.