"At the pragmatic level, if local police are already allowed to do this and are allowed to do this with federal cooperation with the state, then why do they need the [new Arizona] law?" said Muzaffar Chishti, director of the New York office of the Migration Policy Institute, an immigration think tank.
"Diversity is a strength, and the hallmark of America's immigration selection system is our diversity. That's not just ethnic [or] religious diversity, that's diversity of skills and diversity of occupational backgrounds," he said. "We can't engineer this completely, but this is as good as we can get in finding some way of improving the diversity of our country."