Mexico Sent 15,000 National Guard to their Side of the Border to Stop Migrants Crossing the Border. https://www.zerohedge.com/news/2019-06-24/15000-mexican-troops-deployed-us-border When asked if troops were detaining migrants to prevent them from entering the US, Sandoval said "yes."  "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 country's National Migration Institute. 