Succession star Brian Cox says he'd love to tell Boris Johnson to "f**k off" in the style of his character Logan Roy.
The Dundee-born actor, also known for his roles as Bob Servant and Hannibal Lecter, said the prime minister was "a wee fat kid who did good".
The PM has been in Glasgow this week for the COP26 climate conference.
Speaking to Nicky Campbell on BBC 5 Live, Cox said he wasn't a fan of former Labour leader Jeremy Corbyn either, describing him as having "the charisma of a failed geography teacher".
The 75-year-old has garnered critical acclaim and accolades such as a Golden Globe for his performance as motor-mouthed media mogul Logan Roy in Succession.
The darkly comic drama centres on the immensely powerful Roy family and the squabbling among Cox's character's children to seize control.
It was inspired by real life powerful family dynasties such as the Murdochs and the Sulzbergers, owners of the New York Times.
Parts of the second series were shot in Dundee including at the V&A, which stood in for the latest building to be erected in the Roy media empire.
The "Dundee" episode features a hilarious scene in which Logan's kids buy him Hearts FC - only to later discover he's a Hibs fan.
Cox told Campbell that his famous swearing in the series was a blend of dramatic licence and his own love of foul language.
He said: "It's a blend of the two. I think the Scots swear better than anybody.
"The Scots and Irish swear brilliantly. They know how to swear - there's a sort of easiness about it."
The actor also revealed that he shared some characteristics with Roy, including his own complicated relationship with his children.
Cox lost his own father when he was just eight years old and was largely raised by his sisters after his mother suffered a mental breakdown.
"I think the condition that I have of growing absent, and I've done that in my time a lot, sometimes to the detriment of my own children, has been very hard," he said.
"When you have a father who is kind of mythic it kind of panics me because I didn't know how to be a father.
"Growing up I think I got into this habit of just cutting [people] out just to survive.
"It's a bad habit I have carried on later in life. I try not to do it but it's tough.
"We need lessons in being parents but I never had that. I had to wing it."
He also expressed grief at the tragic accidental shooting of cinematographer Halyna Hutchins on the set of upcoming movie Rust.
Star Alec Baldwin had been practising for a shot using a gun he was told was loaded with blank ammunition - only for it to discharge a live round that fatally wounded Hutchins and injured director Joel Souza.
Cox said: "I know Alec quite well and regard him as a friend.
"I'm devastated for this lassie, this extremely talented lassie, who has made her life and become very successful and apparently a wonderful cinematographer.
"For that to happen that way...I've been in films with guns and people are very rigorous about checking weaponry and I'm sure Alec swears there was a happiness and communique established.
"But the residue of it is unbelievable."
In his new autobiography Putting the Rabbit in the Hat, Cox reveals that he had an incident with a prop gun that went off in the face of a stage manager as he was being shown how to use it.
Fortunately, the stage manager got off with nothing more than a singed nose.
Cox added: "That was a comic incident, but this? God almighty. Those poor people. It's just awful - very awful."
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