Donald Trump fell victim to a hoax caller who pretended to be Piers Morgan, the Good Morning Britain presenter said.
Morgan told the BBC’s Americast podcast the prankster rang the then-president in October when he was on Air Force One.
It only emerged when Mr Trump rang the real Morgan out of the blue while on his way to vote in Florida.
The pair had fallen out over Morgan criticising Mr Trump’s handling of the pandemic.
Morgan described the prank call as “an hilarious story,” adding “somebody had called him pretending to be me the day before and got through to him on Air Force One and they had a conversation with Trump thinking he was talking to me”.
The identity of the alleged prankster is unknown. If Mr Trump was duped, he would not be the first prominent figure to be fooled.
In March last year the Duke of Sussex was reportedly tricked into speaking about his decision to quit the royal family by Russian hoaxers posing as activist Greta Thunberg.
Morgan (55) is a long-time acquaintance of Mr Trump (74) and in 2008 won a series of Celebrity Apprentice, a show hosted by the billionaire businessman.
They had been friendly during Mr Trump’s time in the White House before their fallout last year.
Morgan said Mr Trump was a “useless leader” because of his “character flaws – the chronic narcissism, the desire to make everything about himself”.