Mexico filed the amicus brief, or “friend of the court” brief, on Thursday with the 5th U.S. Circuit Court of Appeals in support of the plaintiff in the case, which includes the Biden administration. Amicus briefs are typically filed by parties outside of a case in an effort to show the court how individuals outside of the case will be impacted by its final decision. The brief also highlights how SB 4 would affect Mexico’s ability to govern its own people. “Enforcement of SB 4 would also interfere with Mexico’s right to determine its own policies regarding entry into its territory, undermine U.S.-Mexico collaboration on a legal migration framework and border management, and hinder U.S.-Mexico trade,”

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