Trump wants to deport millions back to Mexico alone, if any of those people and associates (not just family members) get sent back have crossed a cartel in any shape way or form, there will more than likely end up in a bad way (as in dead) if they escaped to the US to be safe.
Trump will have their blood on his hands, esp as I also read somewhere he wanted to deal with these drug cartels, how exactly send the US army in to Mexico to kill them, that would at least be illegal under international law, and could be seen as an act of war by the US on Mexico.
I just hope that any retailiation from the cartels does not trigger a NATO response, as it will be 100 percent the fault of Trump so there needs to be an exception to the attack on one, attack on all thing with NATO otherwise many other countries are going to suffer too, including the UK.