Of course he hasn't. Respectfully: Duh.
The grocery store is a minefield for politicians.
In 1992, President George H.W. Bush, who had "lived the cloistered life of a top Washington bureaucrat for decades," according to the New York Times, was described as being amazed by an electronic grocery scanner, technology that had been in use for more than a decade - though his team later clarified that he had been impressed by a particular scanner that could read torn bar codes. Still, in a recession, the characterisation that he was out of touch took hold - all the way to the polls.
He's not the only politician to fall in the grocery trap: During his 2007 presidential campaign, Rudy Giuliani underestimated the cost of milk and bread by more than half.
And even politicians who go into the store can be criticised for shopping at the wrong one, or buying the wrong thing.
In a famous gaffe, then-candidate Barack Obama posed a question at an Iowa rally: "Anybody gone into Whole Foods lately and see what they charge for arugula? I mean, they're charging a lot of money for this stuff." There were no Whole Foods stores in Iowa at the time - and besides, why wasn't he eating iceberg or romaine like a Real American, anyway?
White House press secretary Sarah Huckabee Sanders said today that she was "not sure" when Trump last went to a grocery store, and added that she wasn't sure it mattered, either.
She later said that the comment was in reference to purchasing alcohol, though Trump did not mention alcohol in his remarks and has previously claimed he does not drink it, and has never smoked a cigarette.
British Prime Minister Margaret Thatcher "used to wield a shopping basket and talk about the price of the pound and say something needed to be done about it," British columnist Tim Montgomerie told the BBC.
Documents released by the Margaret Thatcher Foundation show that the prime minister was briefed on the prices of common goods like eggs, milk and beer.
And weeks after her 2016 loss to Trump, Hillary Clinton was spotted shopping for ingredients for her Thanksgiving dinner in Chappaqua, New York.
Joe Biden attended the grand opening of a Costco in Washington and ate a bunch of free samples. (Politicians: They're just like us! Except when they aren't.)
Grocery stores and certain products have come to be political signifiers on their own, too.
Trump won only 22 per cent of counties with a Whole Foods, wrote Michael Hendrix of the Manhattan Institute. There are "Whole Foods Republicans" and "Sam's Club's Republicans."
Belgian endive became a constant joke in the 1988 election, after candidate Michael Dukakis suggested that struggling corn and soybean farmers try growing the less-common produce - and sales of the vegetable shot up immediately.
If knowing the price of common goods is an indicator of how in touch a politician is, perhaps a better indicator for Trump would be fast food.
He is known to enjoy McDonald's and Kentucky Fried Chicken.
But if you ask him the price of a Big Mac, there's a good chance Trump wouldn't know the answer any better than he'd understand a grocery store: Aides were responsible for picking up his meals.
