Those using stolen SS#'s won't get credit, that will benefit the person who the SS # belongs too.
I find it hard to believe a Mexican can get SS at 55 yrs old since the earliest an American can get it is 62 yrs old and that's at a reduced rate.
Where does your information come from?
Bush signed the treaty back in 2001. We have the same treaty with virtually all European countries as well. But I would dispute the certainty that people whose SS#s are unlawfully used will still get the benefit. If the Socialists in the Senate have their way, they will be working harder to ensure illegals get 'what they paid for' than they will to ensure that you and I aren't getting ripped off by illegals.