Wall Street took a header today.

The Dow Jones Industrial Average plummeted more than 600 points, signaling — possibly, maybe, perhaps — a new Black Friday.

I get that one day does not portend a stock market crash by itself.

However, I am wondering if the president of the United States is capable of offering some calm words of assurance rather than assigning blame for what happened today to millions of Americans’ retirement portfolios.

Ours took a beating today. I am not worried irrationally about our retirement future based on the market’s woes.

Donald Trump has spent a lot of emotional energy of late boasting about how Wall Street has reached record highs in record time. He has taken all sorts of credit for the market performance. He deserves some of it, although millions of the rest of us understand that the market has been climbing steadily during the past eight or nine years after it went through a serious crash to trigger the Great Recession of 2008-09.

Here’s what I would like to hear from the president: I would prefer he would provide some calm words of assurance. I mean, he is a self-described business whiz who’s made zillions of dollars. If he has any knowledge of what transpired today — and if it is a harbinger of more to come — then let’s hear it.

Talk to us, Mr. President, but speak to us like a grownup.