@Baldimo,
Of course the fact that these immigrants are brown skin matters. To say it is "coincidence" contradicts 100 years of immigration history.
Until 1965 our immigration policy was explicitly race based. The law was a race-based quota system which included a law that was actually named "The Asian exclusion act". The rhetoric was that America was a Whit country and that we needed to keep America White (and Protestant).
There are prominent Tea Party conservative right now who are saying (in public) that the immigration reform bill of 1965 which removes racial quotas was a mistake.
Since racism became un-cool (in the 1960's) they have tried to hide it. But it doesn't take much intelligence to see that this "legal vs. illegal" thing is a very thing smokescreen. Just listen to the rhetoric...
These people are demanding that the law be broken (which says these kids need to be processed and treated fairly until they get a hearing). That kind of undercuts their message.