Officials have said that Mexico intervened on Tuesday in a lawsuit by a group of civil liberties organizations challenging Arizona's new immigration law.

It has been reported that the government filed a brief in U.S. District Court in Arizona, CNN reported. Mexico requested that SB 1070 be declared unconstitutional. The plaintiffs include the Mexican American Legal Defense Fund, the National Immigration Law Center and the American Civil Liberties Union.

The brief "underscored that it is fundamental and imperative that the human and civil rights of its citizens are duly respected while present in Arizona or in any other state of the United States," The Mexican Foreign Ministry has said

The most controversial part of the Arizona law, which is to go into effect in late July, requires police to stop those they suspect of being in the United States illegally and demand proof of residence. The government of Mexico said it has a duty to protect its citizens from discrimination.

It was also reported that the Obama administration has also come out against the law. (With Inputs from Agencies)