Joe Biden said losing to incumbent US President Donald Trump in November's election would show he's a "lousy candidate" who "didn't do a good job".
Republican leader Trump had refused to hold the campaign's second televised debate via video link after he was hospitalised with coronavirus this month.
Instead both men held separate town halls - Trump in Florida on NBC and Democrat Biden at the same time in Pennsylvania on rival network ABC.
Anchor George Stephanopoulos asked Biden what it would say about the country if he lost to Trump next month. "It could say that I’m a lousy candidate and I didn’t do a good job," Biden joked.
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