Washington, June 22: US President Dold Trump has proposed to install solar panels on the wall he wants to be built along the border with Mexico, so that the energy produced will help fince it and that Mexico “will have to pay a lot less money”. “We’re thinking of something that’s unique, we’re talking about the southern border, lots of sun, lots of heat. We’re thinking about building the wall as a solar wall so it will generate energy and pay for itself,” Trump said on Wednesday during a rally in the city of Cedar Rapids, Iowa.