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MEXICO CITY — When U.S. Attorney General William P. Barr met with Mexican President Andrés Manuel López Obrador on Thursday, it marked the highest-level discussion of a matter of bitter disagreement between the two countries: Should drug cartels be designated as terrorist organizations?Barr arrived here just over a week after President Trump said in an interview that he is pushing for that designation, a premise that Mexico’s government immediately rejected as “interventionism.”
