One A-lister isn't holding back from sharing what he truly thinks about The Donald as the leading 2016 Republican presidential contender.

George Clooney has blasted Donald Trump over his controversial statements labeling Mexican immigrants as 'criminals' and 'rapists'.

The famed actor, who was speaking at a press conference at the Toronto Film Festival on Saturday, dubbed the billionaire businessman's comments 'idiotic'.

'Clearly, what he said is idiotic, of course it's idiotic,' Clooney said.

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Actor George Clooney spoke about Trump at a press conference at the Toronto Film Festival (pictured)

Trump, pictured last week addressing a crowd in Washington D.C., has been criticized by several celebrities

'Anybody who says as intolerant words as those should be laughed at, and that's pretty much [what] I think eventually history will do.'

Clooney, who is starring in an upcoming fictionalized account of the 2002 Bolivian presidential election titled 'Our Brand is Crisis,' also expressed surprise at Trump's success so far in the presidential race.

Referring to a recent poll, he said: 'Who'd have thought Donald Trump would be at 30 per cent?'

According to a CNN/ORC poll released on Thursday, the real estate mogul currently has a support rating of 32 per cent, making him the first Republican candidate to surpass the 30 per cent mark.

He kicked off his campaign in June by saying that the U.S. 'has become a dumping ground for everybody else's problems'.

'When Mexico sends its people, they're not sending their best,' he added. 'They're not sending you… They're sending people that have lots of problems, and they're bringing those problems with us.

'They're bringing drugs. They're bringing crime. They're rapists. And some, I assume, are good people.'

Following an outcry, Trump refused to apologize for his comments, insisting that everything he said was 'correct'.

Clooney (above in Toronto) also said that 'anyone who says as intolerant words as those should be laughed at'

Trump (pictured last week) has said the U.S. 'has become a dumping ground for everybody else's problems'

Clooney, 54, isn't the only Hollywood star to speak out against Trump recently.

Matt Damon, Clooney's former co-star in the 'Ocean's' franchise, said last month that Trump's comments were 'disgusting.'

Damon, whose wife Luciana Barroso is an Argentine immigrant, said: 'He is talking about anyone who lives south of our border in inhuman terms. He is talking about my wife, my daughters.

'I think we are still laughing at this situation, but if you analyze the things he is saying it is disgusting and dehumanizing,' Damon told Spanish news agency EFE.

Musicians Shakira and Ricky Martin and actress Eva Longoria have also voiced their disapproval of Trump.

Trump has refused to apologize for his verbal attack on Mexican, saying that everything he said was 'correct'

Clooney (at the Toronto Film Festival on Friday) also said he was surprised about Trump's success so far