Sheinbaum has criticized the Treasury for failing to provide evidence supporting its allegations, despite requests for clarity.

The U.S. Department of the Treasury has imposed sanctions on three Mexican financial institutions—CiBanco, Intercam Banco, and Vector Casa de Bolsa—accusing them of laundering money linked to drug cartels and the trafficking of fentanyl into the United States.

The Treasury claims these banks facilitated transfers to Chinese companies involved in fentanyl production, but Mexican officials, including Sheinbaum, argue that these relationships reflect legitimate trade ties.

All three institutions have denied any wrongdoing and expressed their willingness to cooperate with investigations.

Investigations by Mexican financial regulators found only minor administrative infractions, contradicting the serious allegations made by the U.S. government.

Mexico's government has stated it has not received compelling evidence to support U.S. claims and is prepared to act if wrongdoing is proven.

The case against Vector Casa de Bolsa is particularly scrutinized due to its connections with Alfonso Romo, a prominent businessman and former chief of staff to President López Obrador.

The Mexican Treasury Ministry claims that the only verifiable information from the U.S. pertains to electronic transfers to legally established Chinese companies, which appeared normal.

In response to the sanctions, Mexico's banking regulator temporarily took over CIBanco and Intercam to ensure financial stability and protect depositors.

The accused banks have called for a formal investigation by American authorities to clear their names.

The U.S. sanctions are classified as a civil action and will take effect in 21 days, without involving any criminal charges.

The Treasury has linked these banks to several notorious drug trafficking organizations, including the Sinaloa and Jalisco New Generation Cartels.