Joe Biden and Donald Trump are having a first face-off, weeks before US election.
Cleveland:
US Democratic presidential challenger Joe Biden called Republican incumbent Donald Trump a "clown" on Tuesday as tension boiled over in the pair's first televised debate ahead of the November election.
"It's hard to get any word in with this clown -- excuse me, this person," said Biden, moments after Trump was warned by moderator Chris Wallace not to interrupt.
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