Trump’s other BFF, the Washington Post, reports on an admission by the Trump Foundation.

President-elect Donald Trump’s charitable foundation has admitted to the IRS that it violated a legal prohibition against “self-dealing,” which bars nonprofit leaders from using their charity’s money to help themselves, their businesses or their families.

That admission was contained in the Donald J. Trump Foundation’s IRS tax filings for 2015, which were recently posted online at the nonprofit-tracking site GuideStar. A GuideStar spokesman said the forms were uploaded by the Trump Foundation’s law firm, Morgan, Lewis and Bockius.

The Post doesn’t know if the IRS got the same forms.

In one section of the form, the IRS asked if the Trump Foundation had transferred “income or assets to a disqualified person.” A disqualified person, in this context, might be Trump — the foundation’s president — or a member of his family, or a Trump-owned business.

The Foundation said yes.

Another line on the form asked if the Trump Foundation had engaged in any acts of self-dealing in prior years. The Trump Foundation checked “yes” again.

There are no more details.

Philip Hackney, who formerly worked in the IRS chief counsel’s office and now teaches at Louisiana State University, said he wanted to know why the Trump Foundation was now admitting to self-dealing in prior years — when, in all prior years, it had told the IRS it had done nothing of the kind.

I’ll admit to being curious about that.

During the presidential campaign, The Post revealed several instances — worth about $300,000 — where Trump seemed to have used the Trump Foundation to help himself.

In two cases, The Post reported, the Trump Foundation appeared to pay legal settlements to end lawsuits that involved his for-profit businesses.

In one case, Trump settled a dispute with the town of Palm Beach, Fla., over a large flagpole he erected at his Mar-a-Lago Club. The town agreed to waive $120,000 in unpaid fines if Trump’s club donated $100,000 to Fisher House, a charity helping wounded veterans and military personnel. The Trump Foundation paid that donation instead — effectively saving his business $100,000.

They describe more items like that. The last one is paying 10k for a portrait of Trump, which now hangs in the bar of one of his golf resorts.

In September, a Trump campaign spokesman rejected the idea that Trump had done anything wrong, by using his charity’s money to buy art for his bar. Instead, spokesman Boris Epshteyn said, the sports bar was doing the charity a favor by “storing” its art free of charge.

Tax experts said that this argument was unlikely to hold water.

“It’s hard to make an IRS auditor laugh,” Brett Kappel, a lawyer who advises nonprofit groups at the Akerman firm, told The Post then. “But this would do it.”

It certainly made me laugh!