The former vice-president's remarks came as part of his first joint interview with vice-presidential nominee Kamala Harris. The pair accepted their party's nominations during a virtual convention last week. On Monday, Republicans begin their convention to nominate Trump and Vice-President Mike Pence for a second term.

Biden and Harris, once primary rivals who sparred on the debate stage, sought during their sit-down with ABC to project a united front on policy issues from race to health care.

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Harris, the first Black woman to join a major-party presidential ticket, vouched for Biden, a 77-year-old white man, when asked whether she's privately addressed some of his missteps when discussing race. He declared in May that any Black American having trouble deciding who to support “ain't Black,” a comment he walked back the same day and said again Sunday he regretted.