Comment: Metaphor?  This from his speech in Arizona: “On Day One, we will begin working on an impenetrable, physical, tall, powerful, beautiful southern border wall.  We will use the best technology, including above- and below-ground sensors. That’s the tunnels. Remember that. Above and below. Above- and below- ground sensors, towers, aerial surveillance and manpower to supplement the wall..."

The man is delusional.  Mentally ill.  And the people that believe the 'wall talk' are simpletons.