"It's going to get more complicated the way we see it, especially human rights for those who are simply looking for an opportunity to benefit their lives," said García Lara. "There have been many instances where soldiers are simply looking for migrants to prey on.

The Mexican troops will be posted to hot spots along the border with high rates of illegal migration and drug and weapons trafficking.

Mexican armed troops guard the fence snaking along the US border as part of a deal with President Donald Trump, who delayed tariffs on Mexico in exchange for increased efforts

President Donald Trump's threats to impose 25% tariffs on Mexico and Canada have left many cities along Mexico's northern border in limbo