Actually, the Miranda rule already did (and continues to) apply to foreign nationals; the argument was that police should read an additional warning, regarding the right to consult with one's foreign consulate, as required by the Vienna Convention.
In theory, a good idea; were I arrested on trumped up charges in some third world nation, I'd at least like to know the ambassador is aware I am there. In practice, tho, do you really think the Mexican embassy could keep track of every Mexican national currently being held in the U.S.? Let alone offer them any sort of meaningful assitance? Same goes for a lot of countries.
There's nothing wrong with the Miranda rule. These guys were just trying for a "get out of jail free" card.
Keep their butts in prison and reduce aid to their home countries to cover their costs for jailing them.
The fact of the matter is that since being an illegal is a crime unless the suspect informs officers that he or she is an illegal alien the suspect should expect to be treated as an American citizen.
How are the police even going to know if they are foreign nationals before questioning them in many cases?
I suspect that the treaty merely grants them that right, and it is their lawyers that are trying to insist that the police must inform them of that right to prevent them from being held accountable for their crimes.
1. Advocates for illegals want it set up so that no civil servant in the USA can determine the legal residency status of aliens.
2. Civil rights attorneys claim that judgements against their clients should be vacated because the police didn't determine the accused was an illegal who therefore had a right to contact their home country's consulate.
No illegal alien can therefore be a criminal.