US President Joe Biden has hit back at criticism over his age, telling supporters he will win re-election in November after a poor debate performance fuelled concern about his candidacy.

“I know I’m not a young man, to state the obvious,” he told a rally in the battleground state of North Carolina on Friday, one day after he struggled in the televised showdown with his Republican rival Donald Trump.

Mr Biden, 81, said he believed with his “heart and soul” that he could serve another term, as the cheering crowd in Raleigh chanted “four more years”.

Trump, meanwhile, held a rally of his own in Virginia just hours later, where he hailed a “big victory” in the debate, which CNN said was viewed by 48 million people on television and millions more online.

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