It would be his money on the line only initially, of course. Trump has repeatedly promised that Mexico will pay us back for the costs of construction. Occasionally, he insists that Mexico has already committed this money, somehow, through his willfully confused understanding of how the still-as-yet-unratified NAFTA 2.0 will work.

If he genuinely believes the Mexican check is in the mail, he shouldn’t object to bearing the risk while we wait for it.

In the meantime, Trump can afford to float the funds himself, at least if he’s really worth as much as he claims. Plenty of shallower-pocketed Trump supporters have already pitched in with their own contributions through a GoFundMe effort to pay for the wall, which has now raised nearly $19 million.