The most reactionary conservatives, many of them clutching unread copies of U.S. Constitution, are already screaming about the decision of Arizona Federal Judge Susan Bolton to block immediate implementation of central provisions of the state's new anti-immigrant laws.
But all that Bolton did -- with a decision issued hours before the law was to go into effect -- was to assert one of the most basic principles of Constitutional law: that the federal government gets to set immigration policy.
This is not complicated stuff.
Article 1, Section 8 of the document gives Congress the authority "to establish an uniform Rule of Naturalization..."
This is not some totalitarian scheme hatched by James Madison and George Mason back in 1787.
It was one of the most practical things the founders did.