No Sanctuary In Arizona.

The United States' lawsuit against the Arizona immigration law is based upon the concept of federal preemption: That certain matters such as immigration or foreign relations are inherently the domain of the federal government and not the states. While it is true that the Constitution grants the federal government certain powers related to immigration, it does not goes as far as to completely ban states from operating in this domain. The best cases-in-point are so called "sanctuary cities." Such cities generally operate under different standards regarding immigration than the federal government. Though the situation varies from city to city, the federal rules are generally not enforced or under-enforced by sanctuary city governments. The Obama Justice Department has done virtually nothing to stop this practice. By contract, the Arizona law now under attack simply bolsters the enforcement of existing federal rules.