The president left office by snubbing Biden’s inauguration and heading to his Mar-A-Lago resort in Florida.
Statehouses ramped up security in anticipation of planned protests across 50 states, though there were no reports of major clashes by nightfall.
If successful it would make Trump the only president in US history to be impeached twice.
Can Joe Biden repair Donald Trump's damage?
Chao called rioters' attack of the Capitol, which was encouraged by President Donald Trump, “traumatic and entirely avoidable.”
The White House press secretary called the president-elect's address "DIVISIVE" and immediately got taken to task.
Jupiter and Saturn will appear to be so close from Earth on December 21 that they may look like one shining star.
The 91-year-old won himself even more fans during an appearance on British breakfast television.
The 90-year-old made a world first at around 6.45am. Dozens of hubs across the country are now gearing up to start delivering the vaccine.
Pfizer/BioNTech coronavirus vaccine will be available in the UK from next week.