Suicide Squad actor Will Smith has expressed his disgust with Donald Trump's insulting comments towards comedian and talk-show host Rosie O'Donnell. The Republican party's presidential nominee has publicly called O'Donnell a "fat pig" in the past and Smith admits he struggles to understand how the politician has built such a huge following despite his offensive remarks.

Trump, 70, is often criticised for his derogatory language towards women with Democratic presidential nominee Hillary Clinton, Angelina Jolie, Heidi Klum and Arianna Huffington among those on the receiving end. Smith told Australia's "For a man to be able to publicly refer to a woman as a fat pig, that makes me teary. And for people to applaud, that is absolutely f*****g insanity to me."

Smith, 47, continued: "My grandmother would have smacked my teeth out of my head if I had referred to a woman as a fat pig. And I cannot understand how people can clap for that. It's absolutely collective insanity.

"If one of my sons – I am getting furious just thinking about it – if one of my sons said that in a public place, they couldn't even live in my house anymore."

O'Donnell and Trump have been embroiled in a feud for several years. Imagining how the comedian's former partner Kelli Carpenter would have introduced O'Donnell to her parents, Trump said on Fox News in 2006: "Can you imagine the parents of Kelli... when she said, 'Mum, Dad, I just fell in love with a big, fat pig named Rosie'? Can you imagine the expression on their face?"

The Fresh Prince Of Bel Air star Smith added in the lengthy rant: "For me, deep down in my heart, I believe that America won't and we can't [elect Trump]. Of all the things he has said, and we could go through the laundry list, that was the one that was such an absolute illustration of a darkness of his soul. I just cannot figure out how people can clap for that."

Suicide Squad
Will Smith says the support of Donald Trump's presidential campaign is "insanity" Andrew Kelly

Trump has been accused of bigotry after declaring he would build a wall between the US and Mexico, and stating that Muslims should be banned from entering the US. Condemning the presidential hopeful for encouraging divides along race and religion, Smith said: "And there is this really separatist non-inclusive xenophobic, racist wave that is sweeping the globe that is making us pull apart farther than putting us together.

"The importance of leaders is that they have to be level-headed, they have to be calm, because when people get scared, they lose their morality and that reptile mind takes over. It's the type of thing that you see in all forms of nature, but our leaders can't be that."

The actor concluded: "So, we are not even going to pretend it is going to happen. I have faith in America. America has had really critical times but the good [people] tend to make their way to the top."

DC Comic's Suicide Squad, which also stars Margot Robbie and Jared Leto, is out on Friday (5 August) in the UK.

Rosie O'Donnell
Comedian Rosie O'Donnell is one of the many women Donald Trump has publicly insulted Andrew Toth/Getty Images