Deputize U S. citizens to serve as a volunteer militia. Give them blanket immunity from arrest , in the performance of their militia duties and mission . Let old guys volunteer .
I can almost guarantee that if citizens started defending the border themselves, suddenly the State and Federal governments would spring into action.
But it wouldn't be action against the Invaders, it would be action against US citizens.
The US citizens defending the border would be arrested, and if need be, fired upon.
That's how insane things have become.