Donald Trump is the "most incompetent president in the history of the United States of America", according to president-elect Joe Biden.

It comes after Mr Trump addressed speculation by confirming that he would not be attending Mr Biden's inauguration on January 20, which Biden called a "good thing."

In fact, Mr Biden said it would be "one of the few things he and I have ever agreed on", adding: "It's a good thing, him not showing up."

READ MORE: Donald Trump not attending Joe Biden's inauguration

Mr Biden accused Mr Trump of "embarrassing" the US around the world and claimed he was "not fit to serve".

He added: "He has exceeded even my worst notions about him."

Speaking at news conference in Wilmington, Delaware, Mr Biden also spoke about the police officer who died following Wednesday's events at Capitol Hill, where a total of five people died.

He said those responsible for the officer's death would be held accountable and slammed the "bunch of thugs" responsible for the chaos.

READ MORE: Donald Trump facing second impeachment bid after Capitol riot

Earlier on Friday Mr Trump tweeted: "To all of those who have asked, I will not be going to the Inauguration on January 20th."

It follows speculation that Mr Trump was planning to travel to Scotland to play golf, which First Minister Nicola Sturgeon warned would not be permitted under Covid-19 regulations.

That will make Trump the fourth US leader in US history not to appear for their successor’s inauguration, following Andrew Johnson refusing to attend President-elect Ulysses Grant's ceremony in 1869.