No, but trespassing is. And illegal immigrants are trespassing in Arizona. Arizona has a right to deport them. Arizona never attempted to make any laws regarding citizenship.
Quote from OPTIONAL777:
States don't have the right to determine US citizenship, nor the standards by which US citizenship is determined.
What part of United States don't you understand?
Almost everyone with a functioning brain stem knows the moment a state passes and signs into law a case will be presented to a federal judge...not a state judge. The federal judge will immediately stay supercede the state's decision.
Haven't you been paying attention to what happens when a state passes a law that is not in their jurisdiction?
There are federal and state issues, US citizenship is not a state issue, period.
http://www.nationalreview.com/articles/264655/arizona-s-immigration-law-hans-von-spakovsky