Will leave White House if Electoral College declares Biden victor

But "if they do, they made a mistake", he said, adding, "It's going to be a very hard thing to concede".

No concession is needed from Trump for Biden to become president, none has been offered and Trump may never admit he was beaten fair and square. The Trump campaign has filed several lawsuits in key battleground states where they claim mass election fraud took place.

Despite the numbers and the lack of evidence of widespread voter fraud, Trump continues to make baseless accusations.

"You're just a lightweight", Trump snapped, raising his voice and pointing a finger in anger.

Answering his first questions from reporters since the November 3 vote, the president moved closer to accepting that he would serve only one term in office before Biden is inaugurated on January 20.

This comes after Trump told the media earlier this week that he will "certainly depart" the White House if the Electoral College certifies Biden as the victor in the 2020 presidential election.

Biden won the election with 306 Electoral College votes - many more than the 270 required - to Trump's 232, and the electors are scheduled to meet on December 14 to formalize the outcome.

The former Vice President has won more than 80 million popular votes and 306 electoral votes; the President has almost 74 million and 232 electoral votes.

Asked if he'll attend the inauguration, Trump said he knows the answer but doesn't want to say.

The Electoral College vote and the ultimate declaration of the victor by Congress on January 6 are usually symbolic events, but since Trump has declined to concede, they may take on more significance this time.

Trump, 74, is alleging - among other conspiracy theories - that voting machines deliberately deleted millions of his votes, though the government election security agency declared it "the most secure" election in USA history. "I don't know what is going to happen".

Trump spoke to reporters in the White House's ornate Diplomatic Reception Room after holding a teleconference with US military leaders stationed across the globe.

Earlier this week, Trump allowed the official start of Biden's transition to power without conceded defeat.

The president-elect celebrated a quiet Thanksgiving on Thursday, as coronavirus cases in the United States continue to rise.

He said he'll go to Georgia to rally supporters before two Senate runoff elections that will determine which party controls the Senate.

Mason continued to interject, but Trump talked over the correspondent.