Mexico's brief says the law, which is slated to go into effect Sept. 1, undermines U.S.-Mexico relations.
Mexico asks in its friend of the court brief that the federal court declare Alabama's law unconstitutional.
The brief by Mexico and the request to have it included in the case was filed Wednesday. The governments of Argentina, Bolivia, Brazil, Chile, Colombia, Costa Rica, Dominican Republic, Ecuador, El Salvador, Guatemala, Honduras, Nicaragua, Paraguay, Peru and Uruguay also filed a motion seeking to join Mexico's brief.

http://accesswdun.com/article/2011/8/240882