President Trump doesn't drink. His brother, Fred, eight years older, was an alcoholic and warned his little brother.

"He would tell me, 'Don't ever drink. Don't ever drink,'" Trump said. So, he never did. Sadly, Fred Trump died at just 42.

That story is rarely told. But on Tuesday, Twitter went bonkers when Trump held aloft a glass of what looked like wine during a toast during a United Nations General Assembly luncheon — and then, gasp, took a sip.

The goal: Unmask Trump as a two-faced liar — he says he doesn't drink, but, oh yeah, he drinks!

During the lunch, Trump hoisted what looked like red wine, toasting "the potential — the great, great potential — of the United Nations," and appearing to take two sips before handing the glass to an aide. He later raised a glass at another table, toasting U.N. Secretary General António Gutteres, before taking a sip.

So Jennifer Jacobs of Bloomberg News needed to get to the bottom of the huge story — pronto.

Dylan Stableford, digital editor covering media for Yahoo, tweeted:

Katy Tur of MSNBC posted:

Annie Karni, White House reporter for Politico, piled on:

The list goes on and on. "Is that wine or Diet Coke for Trump?" asked NPR lead politics editor Domenico Montanaro.

White House Communications Director Hope Hicks didn't respond to a question about whether Trump made a rare exception to his tee-totaling, the Daily Mail wrote.

So while Trump was delivering an incredible speech to the world, the very people charged with covering his words decided to focus on a sip of wine.

Sounds about right.