The Federal Government has absolutely   NO   Legal control over Immigration Policy

Under our Constitution the Federal Government was given control over Naturalization, not immigration.

Section 8 - Powers of Congress
The Congress shall have Power To lay and collect Taxes, Duties, Imposts and Excises, to pay the Debts and provide for the common Defence and general Welfare of the United States; but all Duties, Imposts and Excises shall be uniform throughout the United States; To borrow money on the credit of the United States; To regulate Commerce with foreign Nations, and among the several States, and with the Indian Tribes; To establish an uniform Rule of Naturalization, and uniform Laws on the subject of Bankruptcies throughout the United States;

Amendment 10 - Powers of the States and People. Ratified 12/15/1791.
The powers not delegated to the United States by the Constitution, nor prohibited by it to the States, are reserved to the States respectively, or to the people.

For all these years we've allowed our governemnt to encroach on our States rights with their failed immigration policy when all the time the states could, and should, have controlled their own immigration policies.

Arizona has every right to legislate and enforce any policy the citizens want, and neither the A.C.L.U. nor "Holder the incompetent" have any say in it. To keep them busy and our of state business just chalange them to show us where the Constitution gives the government the power to regulate immigration. That should keep them busy for a while, it can't be done and all the Liberal manipulating and cheating can't make it so.

Here is an article written in 2006, which explains it quite well