Prince Harry openly discussed Megxit, life in the Royal Family and Donald Trump in a hoax phone call as two Russian men duped him into thinking they were Greta Thunberg and her dad.
It was an embarrassing blow for the Duke of Sussex, 35, who, along with wife Meghan Markle and baby son Archie, will officially quit their roles as senior royals at the end of March.
In an astonishing recording, Harry spoke to the fake Greta about his uncle Prince Andrew, Prime Minister Boris Johnson, his frequent flying, his belief that the world is run "by some very sick people" and his battle with the media.
He was tricked by notorious Russian pranksters Vladimir Kuznetsov and Alexey Stolyarov, who are reported to have called Harry on New Year's Eve and January 22 while the Sussexes were staying in Canada.
Kuznetsov and Stolyarov posted the recording on social media, providing more embarrassing headlines for a Royal Family in crisis.
They posed as Swedish climate change activist Greta, 17, and her father Svante, the Sun reported.
The hoaxers' previous victims include music legend Elton John and US Democratic presidential candidate Bernie Sanders.
The calls involving Harry emerged after he and Meghan attended their final royal engagement - Monday's Commonwealth Day service at Westminster Abbey in central London.
The duke opened up to the fake Greta about his reasons for quitting senior royal life, saying he is withdrawing to "protect my son".
He told the Russians: “It’s, that’s probably a conversation for another time, there’s lots of layers to it and lots of pieces to the puzzle.
“But sometimes the right decision isn’t always the easy one.
“And this decision certainly wasn’t the easy one but it was the right decision for our family, the right decision to be able to protect my son.
Harry was also pressed for his opinion on Donald Trump.
During one call, he said: "I think the mere fact that Donald Trump is pushing the coal industry is so big in America, he has blood on his hands."
'Greta' told the duke that the US President had run away from her, referring to the time Trump refused to be pictured with the real activist.
Harry told 'Greta': “What a surprise."
He told the 'teen' that she would "outsmart" Trump in a conversation about climate change, but she should always meet him when the opportunity presents itself.
Harry, who met Trump at an event in London after the president called Meghan "nasty", said: “Whether you have an option to meet President Trump or an option to meet Boris Johnson, I think I would always."