U2 star Bono has urged Americans not to vote for Donald Trump at the polls in November (16), because he could be the worst thing that has ever happened to the country.

The property tycoon will fight for the U.S. presidency against Democrat Hillary Clinton, and the rocker fears what will become of the country if Trump gets elected.

"America is, like, the best idea the world ever came up with," he told U.S. broadcaster and talk show host Charlie Rose, "but Donald Trump is potentially the worst idea that ever happened to America.

"I think of Emma Lazarus, those lines, 'Give me your tired, your poor, your huddled masses yearning to breathe free...' This is America. This is not from Donald Trump's playbook."

But Bono made it clear to Rose that he isn't opposed to all members of the Republican party - just Trump.

"I don't think he's a Republican," Bono added. "I think he has hijacked the party, and I think he's trying to hijack the idea of America. And I think it's bigger than all of us. I think this is really dangerous...

"Wise people of conscience should not let this man turn your country into a casino."

But the rocker also acknowledged, "I would not diminish Trump supporters or underestimate their angst, because I feel that in a way, they have correctly assessed that the centre parties haven't yet become clear.

"There are very real problems facing not just America, but facing Europe... I’m Irish. I don't have a vote. And I can't be telling people how to vote and don't want to, but I have a voice, and I can say that who sits in that office really affects everyone in this world."

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