Mexico’s new security laws expand military power and erode civilian oversight

The final stage of the National Guard’s militarization is now underway. 

In September 2024, former President López Obrador amended the Constitution to formally place the National Guard—already operating in practice as a military force—under the control of the Ministry of Defense. Last week, Congress convened an extraordinary session to approve legal reforms introduced by President Claudia Sheinbaum. These reforms aim to align at least nine existing laws with the 2024 constitutional amendment and complete the transformation of the National Guard into the fourth branch of the armed forces. These secondary laws mark the culmination of the process initiated by López Obrador and underscore that Morena’s priorities remain unchanged.

Throughout its electoral victories, Morena has made clear its conviction that the military should play a prevalent role in public life. The secondary legislation has further entrenched this vision, and the concern lies not merely in the specific laws being passed, but in the broader ambition to forge a new political regime defined by the primacy of military authority. In liberal democracies, the military sphere is deliberately constrained; in illiberal regimes, it is expanded.

Before the 2024 reform, the Constitution stated that in times of peace, the military could not perform any activities other than those strictly related to military discipline. The constitutional reform changed this, allowing the armed forces to carry out any function established by secondary law. This is a significant shift which opens up many new possibilities for what the armed forces are allowed to do.

For example, the amendments submitted to the legislature expand the powers of this body, authorizing it, among other things, to intercept private communications and carry out undercover operations. This move comes alongside…