In his most forceful remarks yet against Trump, Biden called out the former president -- without using his name -- for weaving what he called a "web of lies" around the 2020 election and attacking American democracy as no other leader has before.

"We must be absolutely clear about what is true and what is a lie," Biden said. "And here's the truth: The former president of the United States of America has created spread a web of lies about the 2020 election. He's done so because he values power over principle -- because he sees his own interest is more important than his country's interest and America's interest -- because his bruised ego matters more to him than our democracy or our Constitution."

"He can't accept he lost," Biden said. "He can't accept he lost even though that's what 93 United States senators, his own attorney general, his own vice president, governors and state officials and every battleground state, all said, he lost."

Establishing Trump as a "defeated former president -- by a margin of 7 million votes in a free and fair election," Biden defended his win against Trump and his supporters by laying out the facts of the election.

A somber Vice President Kamala Harris, in remarks ahead of Biden, said what the "extremists who roamed these halls targeted" last year when was not only an attack on the lives of elected leaders and the 2020 election.

"What they sought to degrade and destroy was not only a building, hallowed as it is. What they were assaulting. were the institution's the values, the ideals that generations of Americans have marched, picketed, and shed blood to establish and defend," she said.

The vice president, who was at the Capitol on the morning of Jan. 6 last year, reflected on what she called "the dual nature of democracy: its fragility and its strength."

"The strength of democracy is the rule of law," she said. "And the fragility of democracy is this. That if we are not vigilant, if we do not defend it, democracy simply will not stand. It will falter and fail."

She ended her remarks with a call to pass Democrats voting rights bills in the Senate as restrictive voting laws are enacted across the country.

"But we, the American people, must also do something more. We cannot sit on the sidelines. We must unite in defense of our democracy," she said.

Arriving on Capitol Hill, reporters asked the president ahead of his remarks how he was feeling heading into the day.

The president, flanked by House Speaker Nancy Pelosi and Senate Majority Leader Chuck Schumer, appeared to respond, "Praying that we will never have a day like we had a year ago today."

Notably, he did not respond when asked if he held Trump personally responsible for the attack.

The three walked towards Statuary Hall, which rioters stormed through one year ago.

To mark one year since a violent mob of Trump supporters stormed through the Capitol -- including Statuary Hall where Biden will soon speak -- and attempted to breach the House chamber in an attempt to undo the 2020 election, in his remarks this morning, Biden will say that Americans are facing a moment when “we must decide what kind of nation we are going to be.”

“Are we going to be a nation that accepts political violence as a norm? Are we going to be a nation where we allow partisan election officials to overturn the legally expressed will of the people? Are we going to be a nation that lives not by the light of the truth but in the shadow of lies?” Biden will say according to speech excerpts released by the White House.

“We cannot allow ourselves to be that kind of nation. The way forward is to recognize the truth and to live by it,” the excerpt read.

While Biden is not expected to mention the former president by name, the White House said he will lay out the “singular responsibility President Trump has for the chaos and carnage that we saw.”

Upon Biden’s arrival to the Capitol, Speaker Nancy Pelosi and Senate Majority Leader Chuck Schumer greeted him. The pair flanked the president as they walked towards Statuary Hall.

Trump responded to Biden's scathing Jan. 6 speech this morning with a lengthy statement claiming it's Biden who "used my name today to try to further divide America."

Though Biden didn't actually mention Trump by name, it was clear he was referencing Trump throughout his speech, fact-checking Trump's persistent false claims the 2020 presidential election was stolen.

Trump lost the 2020 presidential election to Joe Biden by 74 Electoral College votes and over seven million popular votes.

He and his allies filed over 60 lawsuits challenging the outcome of the election over alleged fraud, despite no evidence of widespread fraud that could have had a significant impact on the results. Nearly every single lawsuit was rejected, thrown out, or withdrawn, including two denials from the U.S. Supreme Court.

-ABC News' Will Steakin and Olivia Rubin