US President Donald Trump has confirmed he will address a rally of his supporters Wednesday in Washington, called in protest at the certification by Congress of the 2020 election results.

“I will be speaking at the SAVE AMERICA RALLY tomorrow on the Ellipse at 11AM Eastern (1600 GMT),” tweeted the Republican, who refuses to concede defeat to President-elect Joe Biden.

“Arrive early,” Trump urged — promising “BIG CROWDS!” at the site near the White House.

Earlier,hundreds of Donald Trump’s supporters began massing in Washington on Tuesday, a day ahead of the scheduled protest.

Coming from all corners of America, the demonstrators said they had answered Trump’s appeal to gather in the capital Wednesday, when the US Congress is expected to vote to finalize President-elect Joe Biden’s election victory.

“My commander-in-chief called me and my Lord and Savior told me” to come, said Debbie Lusk, 66, a retired accountant from Seattle.

More than half of Republican voters believe Trump won or aren’t sure who did, according to a survey last month from researchers at top US universities, including Harvard.

That confusion was echoed by many of the mainly upbeat supporters who had gathered under grey skies at a chilly Freedom Plaza near the White House on Tuesday.