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Over the last 28 years, a glittering roster of celebrities have popped up in cameos on The Simpsons .

The show's appeal and popularity is so massive that some big names have signed up to voice characters - often poking gentle fun at themselves.

Ringo Starr, Michelle Pfeiffer, Glenn Close, Danny DeVito and even Michael Jackson have all been part of the cartoon's most memorable appearances.

While it may seem as if the producers are pretty generous with their cameos, there's one celebrity whose offer to feature was politely declined.

(Image: Rex)

During a Comic-Con panel session, executive producer Al Jean was asked if the series had ever turned down a celebrity who wanted to voice a character.

The answer was yes.

According to the Wrap , Jean paused briefly before, then answered, "Let's just say he's the president of the United States."

The Simpsons and Donald Trump do have a history of sorts.

(Image: FOX)

While the show has rejected Trump's offer to voice a character, he has appeared in the show.

There was the now-infamous and spookily prescient episode from 2000 when Lisa Simpson becomes President of the United States, taking over from 'President Trump.'

Dan Greaney, a writer on the show, told The Hollywood Reporter the episode was meant to show a vision of the country ‘going insane’.

(Image: FOX)

Matt Groening, the show's creator, backed this up in an interview with The Guardian, saying:

"We predicted that he would be president back in 2000 – but (Trump) was of course the most absurd placeholder joke name that we could think of at the time, and that’s still true."

The US President was immortalised in The Simpsons to celebrate his first 100 days in office, and was seen perusing reading material called The Little Book of Big Bombs.

So it's safe to say the show is no big fan of the 45th President of the United States.