With the military down at the boarder it is a good time to work on getting the Cartel/drug smugglers. I am quite sure that the cartels are none too happy about these events. While they profit from alien smuggling and use the clutter of illegal immigration to help move their products, drugs are their big cash cow.
The US military on the border is something the cartels have been trying to avoid for decades. Which is why we have not seen the kind of violence on our side of the border as we see in Mexican border towns daily.
I would not be surprised if the cartels tell the "organizers" to stand down or face a dismemberment death.
Well if Trump puts them in tents on both sides of the border they'll likely be protected pretty much from the Cartels I imagine. I say this because this is a world event...it's plastered all over foreign news and S.American tv and such flood the screens 24/7 of these caravans. With reporters embedded filming every thing the news organizations are also a ‘protection’ and assisting them to get here. I don't think the Cartels will do much except on the wayside perhaps. There will surely be those willing to take drugs on their way for a price.