NEW: Per CBP source, there are currently 19,400 migrants in Border Patrol custody nationwide, w/ all 4 major sectors about to hit capacity, or already overcapacity.
We saw mass illegal crossings in RGV this AM, huge groups w/ hundreds. Cartel smuggling wristbands all over ground, Bill Melugin reports.
Most of what we are seeing crossing illegally in the RGV right now are family units. CBP sources tell me a large majority of these migrant families are being released into the US.....