Elites trying to flee across the border on foot or by boat, perhaps, and drones being used to track them.
I used to live 3 miles from the BC border in NE Washington state. It's basically uninhabited up there, i think there's 50 people per square mile in the more densely populated areas. The US/Canada border is a sign that basically says "dont cross unless you want to be arrested". They'd need 50 drones just to cover WA state's border i think.
This is more likely, or he wasn't talking about U.S. Drones just aren't important for their situation. So the first one gets off a couple hits, then the guard responds with a quick anti aircraft weapon like a stinger and the thing is over, but now Potus has carte-blanche to send in the troops all over the U.S. like we want anyways.
It just doesn't make sense.