I mean, it's good to do something about cartels, but, cartels aren't a strictly domestic issue, they are an international issue, or, at least, they involve another country, mainly Mexico.
How is Trump going to stop all the cartels and to keep them from supplying drugs into the US, when they are mainly based in Mexico? He would need help and cooperation from the Mexico government, right? Anyway, I am not saying that it cannot be done, just that it will be very very difficult, if it is to be done properly. Call me paranoid (again), but I think this is just political posturing on the part of Trump to show his supporters how much he cares about the country.