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Donald Trump has mocked Joe Biden's verbal blunders on the campaign trail and suggested they should effectively end his presidential bid.
At one point the US president did an impression of a confused Mr Biden forgetting where he was, asking aides if he was in Ohio or Ireland instead of South Carolina.
Mr Trump repeatedly dubbed the former US vice president "Sleepy Joe" - read more about Mr Trump's rally in South Carolina the night before the state's Democratic primary:
Mr Trump also recounted his shock when Mr Biden mistakenly said in a TV debate this week that 150 million people had been killed by guns in America.
“I said that is a horrible thing, that is the end of his evening, that is the end of his political career,” Mr Trump said. “Then, after the debate, they are saying Joe Biden had a great night last night. I don’t get it.”
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