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EXCLUSIVE: Former President Trump said President Biden is a "true threat to democracy," while reacting to his opponent’s campaign speech marking three years since the Jan. 6 Capitol riot.

Biden delivered a campaign speech in Blue Bell, Pa. Friday, and spent the majority of the address attacking Trump, who holds a massive lead over the GOP presidential primary field.

BIDEN MARKS THREE YEARS SINCE JAN. 6 BLASTING TRUMP, SAYING HE IS 'TRYING TO STEAL HISTORY'

Biden accused Trump of "trying to steal history the same way he tried to steal the election," while saying that the results of the 2020 election proved that he was a "loser." 

But in an interview with Fox News Digital after Biden's speech, Trump fired back.

Donald Trump wearing a red make america great again hat

Fox News Channel will host a live town hall with former President Trump from Des Moines, Iowa on January 10 at 9 p.m. ET. (Sean Rayford/Getty Images)

"The Democrats rigged the last election and they are trying it again," Trump said. "But it won’t work because they have shown how bad and incompetent they are."

"Joe Biden is the worst president in the history of the United States — he is incompetent, he is crooked, and in many respects, he is Benedict Arnold," Trump told Fox News Digital. "He is destroying our country like no one else has done before." 

Trump, pointing to the crisis at the Southern Border, said the United States has "an invasion of millions of people, many from prisons, mental institutions and terrorists pouring into our country." 

U.S. President Joe Biden

A new Washington Post report warned the Biden administration that Democratic Party voters becoming more hawkish on immigration will pose a challenge to its 2024 re-election. (Photographer: Jacquelyn Martin/AP/Bloomberg via Getty Images)

"He is responsible for this," Trump said. "We are a failing nation — a nation in decline — and it is all because he is the worst president in the history of our country." 

TRUMP EDGES BIDEN AGAIN IN NEW 2024 POLL, BUILDS SUPPORT WITH YOUNGER VOTERS

Trump went on to tell Fox News Digital that "because of his gross incompetence, Joe Biden is a true threat to democracy."

"This is not a time for us to have a mentally challenged president," Trump said. 

Donald Trump and Joe Biden

The article warned about Former President Donald Trump beating President Joe Biden in recent polling in swing states. (AP Photo/Alex Brandon)

Trump's comments come as Biden blasted him for "the worst dereliction of duty by a president in American history" and "an attempt to overturn a free and fair election by force and violence." 

YOUNGER VOTERS HELP BOOST TRUMP’S EDGE OVER BIDEN IN LATEST FOX SURVEY

But Trump pushed back, saying: "The only insurrection is the insurrection that is taking place at our border where he is allowing millions of people from parts unknown to invade our country at a level far worse than even a military invasion."

Trump has never been charged with insurrection, despite Special Counsel Jack Smith bringing charges against him related to an investigation into the Jan. 6 Capitol protests and the 2020 election. 

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Smith charged Trump with conspiracy to defraud the United States, conspiracy to obstruct an official proceeding, obstruction of and attempt to obstruct an official proceeding and conspiracy against rights.

Trump pleaded not guilty to all charges.