Outgoing President Donald Trump, who has continuously made baseless claims of the election being rigged, has now turned his ire on the mainstream United States media, accusing them of taking sides and not reflecting his side of the story. He also expressed his unhappiness over the news media's announcement declaring President-elect Joe Biden as the winner of the US Presidential Election 2020.

The mainstream media made the declaration last week and said Trump has lost.

President Trump, however, has refused to concede the election, asserting that he has won. He has filed several lawsuits alleging massive electoral fraud.

Media and state officials have said that they do not have any evidence of large-scale voter fraud. Trump, meanwhile, accused the media of supporting Biden during the election campaign.

"Why does the Fake News Media continuously assume that Joe Biden will ascend to the Presidency, not even allowing our side to show, which we are just getting ready to do, how badly shattered and violated our great Constitution has been in the 2020 election," Trump asked in a tweet on Sunday.

"It was attacked perhaps like never before! The World is watching!" Trump said.

Earlier in the day, Trump said that many of the court cases being filed all over the country are not his, but rather those of people that have seen horrible abuses.

"Our big cases showing the unconstitutionality of the 2020 Election, & the outrage of things that were done to change the outcome, will soon be filed! We won't let a RIGGED ELECTION steal our Country!" he said in another tweet.

For the first time earlier on Sunday, President Trump appeared to grudgingly acknowledge that Biden won the closely-fought race for the White House, but indicated that he would not concede and would keep trying to challenge the "rigged" election outcome.

His declaration comes as he and his administration continue to accuse the Democrats of election fraud without evidence and impede the transition. According to the schedule, Biden will be inaugurated as the next US President on January 20.

As per the latest count of the electoral college votes coming from all the 50 states, Biden has 306 of the 538 electoral college votes, which is well above the halfway mark of 270.

Trump, who has 232 electoral college votes, has challenged the election results in various states including Pennsylvania, Nevada, Michigan, Georgia and Arizona. He had demanded a recount in Wisconsin.

As Trump, 74, has refused to concede the election, the transition team of Biden and vice-president-elect Kamala Harris says that the Trump administration is not cooperating with them in transition.

On Thursday, US election officials said the 2020 presidential election was the "most secure in American history", rejecting President Trump's fraud claims.