Mexico is Paying for the Wall of Mexican Soldiers Preventing Illegal Immigrants’ Entrance Into U. S. How Much the Cost?

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Leftists mock president Trump that the government of Mexico is (supposedly) not paying for the Wall along the U. S. southern border, yet while Trump is deploying funds without congressional help to build the Wall, the government of Mexico has deployed about 25,000 troops along the border preventing the illegals from going into the U. S., so how much is that costing the treasury of Mexico, maybe a few billion dollars per year until the Wall needed will be completed?