"There is a kind of contest to see who is the most brazen in blaming Mexico," President Lopez Obrador said.
Full StoryYolanda Sanchez left a shopping plaza on Saturday, when an armed group intercepted the vehicle in which she was traveling.
Full StoryU.S. border officials have made more than 45,000 migrant encounters in the last five days alone.
Previously, Senator Rojas proposed amending the Mexican constitution to make outgoing presidents honorary legislators without voting rights.
López Obrador led the flag-raising ceremony at half-mast in the center of the Constitution Square, best known as the capital's Zócalo.
The Mexican nation seeks to shape "a new world" and promote South-South cooperation.
The Western District of Texas pointed out that the 300-meter-long barrier constitutes an "obstruction to navigability" of the Rio Grande.
She has a PhD in physics and studied at the National Autonomous University of Mexico.
The Mexican president has accused the U.S. government of not doing enough to combat drug abuse, especially among its youth.
This incident marks another friction point between Mexico and Texas due to Governor Abbott's anti-immigrant policies.
An arbitration panel would determine whether or not the Mexican policy on transgenic corn is incompatible with the trade agreement.