Mexico Joins Arizona Immigration Lawsuit Mexican government backs ACLU challenge to immigration law 62 comments Comments (AP) (User Submitted) – The latest party jumping on the Arizona anti-illegal immigration lawsuit bandwagon? The Mexican government. Joining the Obama administration, the ACLU, and several other organizations' legal challenges to the yet-to-be-enacted law, the Mexican government submitted papers in US federal court as a "friend of the court" in support of the other suits. The proposed law, they argue, is "unconstitutional" and may damage bilateral relations. "Mexico has a duty to protect its citizens and ensure that their ethnic origin is not used as a basis for committing discriminatory acts," the Mexican foreign ministry said. Read the full article.