Donald Trump releases the 'most important speech' he's ever made, says he 'doesn't mind' losing the election

Donald Trump has delivered potentially "the most important speech I've ever made", revealing he "doesn't mind" losing the election - but continuing to deny the results and peddle misinformation.

The incumbent US President unexpectedly released a 46-minute-long pre-recorded speech from the White House on social media on Thursday morning (NZ time).

"This may be the most important speech I've ever made," he said. "I want to provide an update on our ongoing efforts to expose the tremendous voter fraud and irregularities which took place during the ridiculously long November 3rd elections."

Democrat Joe Biden was declared the winner by news outlets after securing states worth 306 electoral votes, and is expected to take office in January next year.

But Trump has disputed the outcome, alleging widespread voter fraud and launching legal action in several battleground states. As his hopes of overturning the result dwindle, Trump has continued to make false election claims - pushing baseless claims during the speech.

He claimed he is trying to "protect our election system" which is under "coordinated assault and siege".

"It was all very, very strange. Within days after the election, we witnessed an orchestrated effort to anoint a winner even while many key states were still being counted," he said.

"We are going to ensure the honesty of the vote by ensuring that every legal ballot is counted, and that no illegal ballot is counted.

"This is not just about honouring the votes of 74 million Americans who voted for me. It is about ensuring that Americans have faith in this election and in future elections."

He went on to claim the campaign "already has the evidence" it needs to prove election fraud, although he didn't provide evidence to back up the claims.

"This election was rigged. Everybody knows it," he said.

"I don't mind if I lose an election. But I want to lose an election fair and square. What I don't want to do is have it stolen from the American people.

"That's what we're fighting for, and we have no choice [but] to be doing that. We already have the proof, we already have the evidence, and it's very clear.

"Many people in the media, and even judges so far, have refused to accept it. They know it's true, they know it's there, they know who won the election. But they refuse to say, 'You're right.' Our country needs somebody to say, 'You're right.'"

In one part of the speech, Trump held up charts showing when the results of votes were released.

He claimed Michigan's decision to release the results of hundreds of ballots one morning, which tipped the state in Biden's favour, was a case of fraud.

"I'll tell you what's wrong - voter fraud. For example in Michigan, at 6:31 in the morning a vote dump of 149,772 votes came in unexpectedly. We were winning by a lot, that batch was received in horror, nobody knows anything about it... All of it was normal and then boom. I went from winning a lot to losing a tight race. It's corrupt. Detroit is corrupt, I have a lot of friends in Detroit and they know it, Detroit is corrupt."

In other parts he slammed Georgia, claiming the battleground state was not checking signatures on ballots, leaving thousands "out of whack".

The speech comes after reports Trump openly mused about running for President again in 2024 if his legal action cannot overturn the 2020 results.

Currently, Presidents can be elected to office for two terms, which don't have to be consecutive.

"It's been an amazing four years. We are trying to do another four years. Otherwise, I'll see you in four years," he told guests at a White House Christmas party on Tuesday, according to news outlet SBS.

No media was allowed at the event, which was attended by several Republican Party powerbrokers, but a video posted to social media captured the comments.