‘The higher it goes, the more valuable it is,’ president says U.S. ‘spending a lot’ on design and planning of wall, he says U.S. President Donald Trump said he’s proposed building a “solar wall” on the Mexican border that would pay for itself by generating electricity. “We’re thinking of something that’s unique, we’re talking about the southern border. Lots of sun, lots of heat,” Trump said at a campaign rally in Cedar Rapids, Iowa. “We’re thinking about building the wall as a solar wall, so it creates energy, and pays for itself. And this way Mexico will have to pay much less money, and that’s good. Is that good?” Donald Trump says “we will build a solar wall” along Mexico border https://t.co/598isRMkuF pic.twitter.com/Fa63a65tBj — Bloomberg (@business) June 22, 2017 Trump ran for the presidency on an oft-repeated promise to construct a wall across the 1,933-mile (3,207 kilometer) Mexican border […]