On Tuesday, a judge ordered that former social development minister Rosario Robles be detained pending a trial over suspected losses to taxpayers. Lopez Obrador said judges would decide whether more people were implicated.

After offering some general reflections on the Robles case at his regular morning news conference, Lopez Obrador was asked by a reporter whether there was any sign of an investigation against Pena Nieto, and he replied: "No, there isn't.