Biden beat Trump in the presidential election by 306 electoral college votes to 232.
Despite the transition to Biden's presidency already being underway, Trump has refused to concede and has repeatedly voiced unfounded claimed of widespread voter fraud.
Trump's campaign has launched dozens of lawsuits in the wake of the election and forced multiple states where Biden claimed victory to recount their votes.
The President and his allies have now lost at least 30 post-election lawsuits. By some counts, the number is as high as 41-1 losses.
One of the latest lawsuits from a Trump supporter challenging the election results in Georgia, Michigan, Pennsylvania and Wisconsin has been branded the "craziest" and "dumbest" case so far.
Texas Attorney-General Ken Paxton, a Republican, announced his intention this week to sue the four swing states in the US Supreme Court.
In his filing, Paxton argues the states in question "exploited the Covid-19 pandemic" to enact "last-minute changes" to their electoral rules, "skewing" the outcome of the election.
He also argues the probability that Biden could have won the popular vote in all four of the defendant states, given Trump's early lead in them "as of 3am on November 4", was "less than one in a quadrillion, or 1 in 1,000,000,000,000,000".
Trump's early leads in these states were due to the election votes, which favoured him, being counted first. The mail-in votes, which favoured Biden, were counted later, causing Trump's lead to evaporate.
Trump's campaign has continually claimed Biden overtaking Trump in these key states was because of voter fraud.
Rick Hasen, an election law expert and professor at the University of California, branded Paxton's recent lawsuit as "the dumbest case I've ever seen filed on an emergency basis at the Supreme Court".
Late last month, Trump came the closest he has ever been to admitting he lost the election.
While speaking to reporters after a Thanksgiving Day event at the White House, the president confirmed he would leave office if the electoral college voted for Biden on December 14.
"It's going to be a very hard thing to concede because we know there was massive fraud," he said.
"So as to whether or not I can get this apparatuses moving this quickly, because time isn't on our side – everything else is on our side, facts are on our side – this was a massive fraud, this should never take place in this country, we're like a third-world country. It was a rigged election."
Asked again whether he would concede if the electoral college voted for Biden, Trump said: "If they do, they made a mistake because this election was a fraud. So no, I can't say that."
It took another reporter pressing the question before Trump finally revealed he would leave office if the December 14 vote didn't go his way.
"So if they do [vote for Biden], you won't leave the White House?" the reporter asked.
"Certainly I will," Trump replied.
"Certainly I will. And you know that. But I think that there will be a lot of things happening between now and January 20. Massive fraud has been found. We're like a third-world country. We're using computer equipment that can be hacked. They talk about glitches. How many glitches did they find? Oh, gee, we had a glitch, 5000 votes."
But since then rump has reverted back to insisting he was the winner of the election and vowing to "never surrender".
Last week, Trump held his first political rally since the election, in which he wrongly claimed he won Georgia.
"You know, we won Georgia, just so you understand. And we won Florida. And we won a lot of places. Thank you very much. No, we won a lot of places. We won Florida, and we won Ohio," the outgoing President told the crowd.
While he did win Florida and Ohio, Georgia has recounted its votes twice, and Biden has been named the winner each time.
"I think they say that if you win Florida, and if you win Ohio, in history you've never lost an election. This has got to be a first time. But the truth is, they were right. We've never lost an election. We're winning this election," Trump said.
"We continue to fight. We've had some great moments. We just need somebody with courage to do what they have to do. Because everyone knows it's wrong. We need somebody with courage, somebody that makes decisions.
"And we'll be going up to the Supreme Court very shortly, and really, if we have courage and wisdom, I think you know what the answer's going to be. Because you can't let people get away with what they got away with."
