With 1,046 km of the border already fortified, the new construction would extend almost the length of the entire border. Many cost estimates and timelines have been floated since Trump campaigned on the promise of building a wall. Trump has said Congress should fund the wall upfront, but that Mexico will reimburse U.S. taxpayers. The third phase would cover an unspecified 1,728 km, essentially sealing off the entire U.S.-Mexico border. The report estimated that agreement alone could bring the cost from $11 million per mile to $15 million per mile in one area.

Source: National Post February 10, 2017 14:40 UTC