The entire U.S.Mexico border covers 22-hundred miles from California to Texas and Arizona's portion is only about 15 percent.
There's an old saying about building barriers along the US Mexico border. If you build an 18 foot fence or wall there's always someone on the south side who has a 19 foot ladder. They will find a way to go over, around and even under through tunnels as was the case this month - the discovery of a tunnel that originated at a cemetary.
Residents in Nogales see it first hand. "I see a wall that the people can just crawl right up and go right over. They started the day it was built," said Michael Kimberlin.
Nogales is at the center of it all -- Arizona's border with Mexico is 350 miles long. Most of us see what is considered a pedestrian fence. Reported to cover about 120 miles -- not confirmed though because the Customs and Border Patrol is compiling the current data for KGUN9.
And it's reported there's about 180 miles of vehicle fencing -- covering vast open space -- east and west of Nogales -- to keep drug and human smugglers out.
And it's reported about 60 miles doesn't have fencing because of mountains and treacherous terrain.
Customs and Border Patrol tells us that barriers can't keep 100 percent of crossers out, but they do act as a deterrent.
Mexican leaders and critics have condemned Trump for vowing to build a great wall on the southern border. But in the world of politics we know what remains constant is change. What was said six months ago may not be the mindset today.