Who will pay for the wall (solar wall that is)--- Investors would--- and the sun would pay them back

Trouble getting congress to fund the construction of a border wall with Mexico doesn't have to be a deal breaker. Investors would be willing to fund it, be paid back with revenue from the solar panels on it (largest solar project in the world). The record breaking solar component would come at a good time to show the Paris Accord signers that there is talk and then there is doing. Pres. Trump would get this very environmentally friendly project done. Investors could include countries like China, large insurance companies and pension funds. Sections of the wall could be owned by corporations and the US gov't could lease the land under it to them perhaps. The art of the deal :)