PHOENIX (AP) – The Mexican government has urged a U.S. court to stop Arizona from enforcing a minor section of the state’s 2010 immigration law that prohibits the harboring of illegal immigrants.

Lawyers representing Mexico asked the 9th Circuit Court of Appeals in a filing Wednesday to uphold a lower-court ruling that blocked police from enforcing the ban. Mexico argued the ban harms diplomatic relations between the United States, undermines the U.S.’s ability to speak to a foreign country with one voice and encourages the marginalization of Mexicans and people who appear to be from Latin America.

“Mexico cannot conduct effective negotiations with the United States when the foreign policy decisions of the federal governments are undermined by the individual policies of individual states,” lawyers for the Mexican government said in a friend-of-the-court brief.

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