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Watch as Joe Biden held a campaign rally in Philadelphia, where the Kennedy political family endorsed his re-election campaign.
Their backing is a rebuke of Robert F Kennedy Jr’s independent bid for office.
Mr Kennedy is the son of slain US senator and presidential candidate Robert F Kennedy.
He was an environmental lawyer before being a vocal anti-vaccine advocate with mixed political views.
Mr Kennedy has garnered the support of 15 per cent of registered voters, as opposed to 39 per cent for Biden and 38 per cent for Trump, Reuters/Ipsos poll figures which are likely to worry both parties.
Robert F Kennedy Jr’s younger sister Kerry Kennedy voiced her opposition to Mr Trump’s “outrageous lies and behaviour”.
The family is expected to join door-knocking and phone-banking volunteers for the Biden campaign.
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