Donald Trump has condemned rioters who stormed the US Capitol building on Wednesday - calling it a "heinous attack".
Four people died after his supporters broke into the House chamber, while a fifth person - a police officer - has died as a result of injuries.
Donald Trump says he's 'outraged' by the riots.
Mr. Biden formally takes office on the 20th of January, with Mr. Trump saying there will be an orderly transition.
Marking the end of a temporary Twitter ban - he posted this video:
