Instead of pepper spray, they should Polish them off as a detergent.
A target rich environment. Take out one or two by sniper fire and the rest will back off.
Pepper spray? Phooey.
This calls for M-60 machine gun emplacements; the first bunch that tries to rush the borders gets hosed and the bodies left as a warning.
And if the migrant’s countries complain tell them, “stay in your own country and you won’t get shot.”