Donald Trump says the favourite to go up against him in the US Presidential election is 'not a competent person'.
Joe Biden threw his weight behind Kamala Harris to take the Democratic nomination after he decided to withdraw from the race.
The 81 year-old's decision follows concerns about his fitness to serve another four years.
He thinks it's in the best interests of his country and party to step down, but insists he will see out his term of office.
Ameshia Cross is a democratic strategist:
"He's been in public service and public life for 54 years. He's a president who has a record of achievement, one that is the greatest when it comes to a first term president that we've ever seen in this country since Franklin Delano Roosevelt. This was a difficult decision to make".
