I would think they would have a stronger case against “sanctuary cities” for under enforcing the law than against Arizona for over enforcing the law. But then this Justice Dept. is not about the law.
If you were to consider the unchecked, rampant illegal immigration an invasion (which I think there is ample evidence to support) then the “sanctuary city” policy is an act of Treason, for it is nothing less than giving aid and comfort to the enemy.