"Which gives you a little bit more waterfront property if you're lucky enough to own it," he said about sea level rise at a rally in Chesapeake, Virginia, back in June.

"You'll have more oceanfront property, right?" he said during his online conversation with billionaire Elon Musk on Aug. 12 when the topic came up.

And at his rally on Saturday in Wilkes-Barre, Pennsylvania, Trump again dismissed climate change and its associated sea level increase, saying that it "will give you slightly more beachfront property if it happens."

"I would have told him that doesn't make any sense," said one informal adviser who spoke on condition of anonymity, adding that Trump had not sought out his opinion on the matter. "He just says crazy ----."

Why he would insist on repeating such a plainly absurd assertion is unclear.

The guys in white coats with the straitjackets can't be that far away.