The 81-year-old president issued the warning in his first TV interview since he announced on July 21 that he would not be seeking re-election.
Asked if he believed there would be a peaceful White House changeover in January, the timescale after a November election, Mr Biden told CBS News: “If Trump loses, I’m not confident at all.”
His comments echoed his earlier warnings about Republican candidate Trump and democracy.
“He means what he says,” he added, arguing: “You can’t love your country only when you win.”
Trump, 78, the first former or sitting president to be convicted of a crime, appeared, according to polls, to be heading back to the White House for a second term after the failed assassination attempt against him last month.
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