US President Donald Trump and Vice President Mike Pence, far left, at Mr Trump's inauguration ceremony in 2017, an event that was attended by former president Barack Obama and his wife Michelle. AP 
US President Donald Trump and Vice President Mike Pence, far left, at Mr Trump's inauguration ceremony in 2017, an event that was attended by former president Barack Obama and his wife Michelle. AP 

Trump 'delegitimising' democracy by not conceding US election, says Obama