Earlier this month, Washington and Mexico City hammered out an 11th-hour deal to avoid the imminent imposition of tariffs on Mexican goods entering the United States.
Defense Minister Luis Cresencio Sandoval said the personnel is a mix of army units and the country's national guard, and he acknowledged they are detaining migrants preparing to cross into the U.S.
He said another 2,000 National Guard troops had already been deployed to the country's southern border with Belize and Guatemala. Most of the people caught on the U.S. -Mexico border are from three Central American countries of Guatemala, Honduras, and El Salvador.
"If we left it completely in the hands of the National Institute of Migration it wouldn't be possible", he added, according to Reuters. Mexico, however, has also called on the United Nations and the United States to help with the monumental task. The Mexican security forces had not typically detained migrants at the United States border in the past.
"Given that (undocumented) migration is not a crime but rather an administrative violation, we simply detain them and turn them over to the authorities" at the National Migration Institute.
Former Mexican national security official Gustavo Mohar said Mexico's security forces had not been used this way before, describing the development as "sad".
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The United States and Mexico reached a deal on June 7, giving Mexico 45 days to demonstrate that it is helping to significantly curb the flow of illegal immigrants into the United States.
However, he added: "We have to avoid a confrontation with the government of the United States".
Mexico's shift toward border enforcement comes after the Trump administration threatened to impose tariffs on Mexico if it does not stop migrants from illegally entering the US.
On June 7, Trump announced that the USA and Mexico had reached an agreement that suspended the tariffs.
The decision to deploy troops to Mexico's northern border is a different approach than the country has normally taken.
However, worldwide law protects the right of undocumented migrants to cross global borders to request asylum.