“Years before Andrés Manuel López Obrador was elected as Mexico’s leader in 2018, U.S. drug-enforcement agents uncovered what they believed was substantial evidence that major cocaine traffickers had funneled some $2 million to his first presidential campaign.

According to more than a dozen interviews with U.S. and Mexican officials and government documents reviewed by ProPublica, the money was provided to campaign aides in 2006 in return for a promise that a López Obrador administration would facilitate the traffickers’ criminal operations.”