U.S. Investigated Suspected Ties Between Mexican President's Allies and Drug Cartels American law enforcement probed allegations that allies of Mexican President Andrés Manuel López Obrador received millions from drug cartels. The U.S. investigation unearthed potential connections between cartel members and Mexican officials close to the president but did not find direct evidence linking the president himself to criminal organizations. Despite this, American officials did not pursue a formal investigation against Mr. López Obrador due to limited interest in pursuing allegations against a top U.S. ally. The Mexican president denied all accusations and emphasized that the allegations would not affect Mexico's relationship with the United States. This inquiry, along with previous scrutiny over alleged campaign donations from traffickers, has raised concerns about the U.S.-Mexico relationship and could potentially impact negotiations on issues like migration and drug enforcement. The decision to let the recent inquiry go dormant was influenced by a separate controversial corruption case involving a former Mexican defense secretary, General Salvador Cienfuegos Zepeda, which soured law enforcement relations between the two countries.