AFP reported that Biden's warning came with lawmakers and analysts voicing concern over increasingly bellicose campaign language ahead of the vote.
Trump — who survived an assassination attempt in July and another apparent plot in September — alleged widespread fraud after his defeat to Biden, and pro-Trump rioters riled up by his false claims ransacked the US Capitol.
"I'm confident it will be free and fair. I don't know whether it will be peaceful," Biden told reporters as he discussed the election.
"The things that Trump has said and the things that he said last time out when he didn't like the outcome of the election were very dangerous."
AMK/PR
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