Must be a union contract.
"in an area where labor costs are far lower than in the United States."
Well, Israel does not have millions of Mexican illegals readily available as we do, at low cost, to build the wall. Heck, aren't they also rebuilding New Orleans? Have them build the wall and leave them on the South side of it when complete.
Of course it is a union contract. We should hire the Minutemen. In fact, I bet the Senators who don't want it will make sure it costs a billion per mile, just to show us.