Numerous organizations including the American Civil Liberties Union (ACLU) and the United States Department of Justice filed lawsuits challenging the constitutionality of the Arizona law and asking for an injunction to prevent the law from going into effect.

Numerous organizations including the American Civil Liberties Union (ACLU) and the United States Department of Justice filed lawsuits challenging the constitutionality of the Arizona law and asking for an injunction to prevent the law from going into effect.