Donald Trump has crumpled up yet another presidential custom and tossed it into the nearest crapper.

There once was a time when presidents didn’t criticize openly the chair of the Federal Reserve Board. Not this guy. Not this president.

Trump says he “maybe” regrets appointing Jerome Powell as Fed chairman. He gripes that “I’ve got a good economy going” and Powell is wrecking it by raising interest rates, causing the stock market to wobble and then crater.

You see, Trump yet again seems upset that his personal reward from serving in the highest office in the land is being diminished because an economic pro is taking measures commensurate with a healthy economy.

As for the president’s criticism of the Fed chairman, it flies directly in the face of a longstanding custom to shield the Fed from political criticism. Trump doesn’t recognize customs that historically lend dignity to the office.

To think, too, that the president is savaging a chairman who he appointed himself.

Weird, man.