We're thinking of something that's unique. We're talking about the southern border, lots of sun, lots of heat," he said.
"We're thinking about building the wall as a solar wall so it creates energy, and pays for itself.
He then joked it would mean Mexico "will have to pay much less money" to build it.
"You're the first group I've told that to, a solar wall, makes sense ... solar wall, panels, beautiful," Mr Trump said.
"I mean, actually think of it — the higher it goes the more valuable it is.
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Mmmmm .... I can think of something that would send his enormous ego into overdrive ??
I know it has very little chance of happenning
But I still would hope Roger would give this a try because I don't think any thing else is likely to get our towers build