The president of the US went head to head with Donald Trump in the first debate of the election last week
Former US president Obama has been urged to "step in" after there have been fresh calls for Joe Biden to step down following his debate last week.
Biden has been heavily criticised for his performance when he went head-to-head with Donald Trump ahead of November's US election.
After the "car crash" debate, Obama rushed to the defence of the US president and said that "bad debates happen."
