There are some questions no-one should ever ask.
"What does this red button do?"
"What do people say about me?"
"Do you believe in Santa Claus?"
Now we all know Santa Claus exists. But for some reason, the US president threw doubt on this when speaking to one child on Christmas Eve.
The scene was the State Dining Room in the White House.
Donald Trump and his wife Melania were taking calls from American children as the couple sat under two gargantuan Christmas trees.
All the children who called in had done so in the hope of getting through to Norad, the government agency that tracks Santa's movements around the world at Christmas (that is still operating despite a partial government shutdown).
Some of those calls were patched through to Mr Trump and his wife, and thanks to pool reporter Kevin Diaz, we know some of what the president said.
This is how Diaz reported the exchange:
Trump (in booming voice) to a kid named Coleman: "Hello, is this Coleman? Merry Christmas. How are you? How old are you?.... Are you doing well in school? Are you still a believer in Santa?"
Footage of the incident circulating on social media shows Mr Trump then telling the boy: "Because at seven, it's marginal, right?"
Coleman's response is not clear.
And nor is it clear why Mr Trump asked this particular question, because, of course, Santa's existence is beyond dispute.
The rest of the calls passed without incident, with warm wishes from both Trumps to those who called in, reports BBC.
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