He’s explicitly expressing continued loyalty to his former country and it’s government.
It doesn’t matter whether it’s ok by Mexico’s rules, there’s no way that isn’t a direct violation of his oath of US citizenship.
Trump should nail his a** to the wall on that.
They ALL take the oath with their fingers crossed.
If we end up in a war with Mexico, we know whose side they will be on.
People with dual citizenship (and there are many, most of them not from Latin America but from Europe) are loyal citizens of their country of residence but also good citizens of their country of birth or adoption, because countries that are in radical disagreement do not permit dual citizenship. There are many dual Irish-American and other European citizens; actually, many of them can vote in EU elections in other countries.
They probably wouldn’t bother to do so unless they were personally involved in something, and since US voter turnout is lower than low (except among certain groups, such as black Democrats, most of whom are probably dead), I’d say any voting for anything anywhere is probably a step in the right direction.
Many Latin American and other countries fine people for not turning out to vote, btw. Even if you vote “en blanco,” which would be a blank ballot indicating your disgust with either option, you have to vote. We don’t have to vote here, and most people won’t vote.
In NYC, De Blasio was elected by a micro-sliver of the population, because only a slightly larger sliver bothered to vote at all.
It’s okay by US rules too because this doesn’t affect the US. These voters are US citizens, and vote in US elections, but couldn’t vote in their countries of origin until the last few decades. However, with so much out-migration, even countries that do not have dual citizenship agreements with the US realized that they should permit their emigrants to vote in local elections because that could help their country.
Mexico began to allow naturalized US citizens to vote in their elections in the 1980s (under Reagan, IIRC) and this has been helpful to Mexico.
I don’t see any problem. You have a handful of educated, US-exposed Mexicans (or people originating from other countries anywhere in the world) voting in their local elections - since like all immigrants, they still stay in touch with their country of origin, just as my French, English, Swedish, German and Irish ancestors did over the centuries that my family has been here.