The US presidential election will "change America" and have "consequences for the world for 40 years", Cher says.
The musician labelled Republican presidential candidate Donald Trump "dangerous" and "terrific at lying", while also suggesting younger generations struggle to trust Democrat Hillary Clinton.
"I don't know how he's a candidate, he is so dangerous, and what he brings to my country, what he's awakened in my country, is bigotry and distrust and a certain kind of supremacy in certain groups, and he lies.
"He's amazing, he tells something and then you go back and see what he's said and it seems like the truth both times, he's so terrific at lying. I've never seen anyone so good, it's amazing. I could go on and on on this subject forever because I'm so traumatised by him. I am truly traumatised by him."
Cher, speaking at the One Young World Summit in Ottawa, Canada, did not reserve her criticism just for Trump.
"It's not easy, because especially millennials - they're not drawn to Hillary; they don't trust her, they feel that her sins are really enormous," she said.
"If you delve into some of the things she's being accused of - she's screwed up and that's for sure.
"But I've known her for a long time and I think that she will do her best. And she's a politician, but she will do her best. If you look at her from the beginning of her life till now, she's worked hard for people."
The Oscar-winning actress, 70, was launching a campaign to free animals in captivity, but could not help lending her thoughts on the upcoming election.
She added: "What they need to know is that this election will change America and have consequences for the world for 40 years and the people who will suffer the most are millennials.
