US President Joe Biden has accused his predecessor Donald Trump of posing a continuing threat to American democracy in a speech on the anniversary of the deadly US Capitol attack by Trump supporters who tried to overturn his 2020 election defeat.
Speaking at the white-domed building that was the scene of the 6 January 2021, riot, Mr Biden warned that Mr Trump's false claims that the election was stolen from him through widespread voting fraud could unravel the rule of law and undermine future elections.
"We must be absolutely clear about what is true and what is a lie. Here's the truth: A former president of the United States of America has created and spread a web of lies about the 2020 election. He's done so because he values power over principle," Mr Biden said.
The speech was a departure for Mr Biden, who has spent most of his first year in office focused on pursuing his own agenda rather than looking backward.
But Democrats, a handful of Republicans and many independent observers have warned that the damage Mr Trump did before the riot - in an incendiary speech to supporters in which he repeated his false election claims and exhorted them to go to the Capitol and "fight like hell" to "stop the steal" - lingers on.
"One year ago today in this sacred place, democracy was attacked. Simply attacked," Mr Biden said. "The will of the people was under assault. The Constitution, our Constitution, faced the gravest of threats."
Mr Biden added that "for the first time in our history a president had not just lost the election he tried to prevent the peaceful transfer of power".
He condemned Mr Trump for watching the riot on television "and doing nothing for hours".
"This wasn't a group of tourists. This was an armed insurrection," Mr Biden added. "They weren't looking to uphold the will of the people. They were looking to deny the will of the people."
According to Reuters/Ipsos polling, some 55% of Republican voters believe Mr Trump's false claim, which was rejected by dozens of courts, state election departments and members of Mr Trump's own administration.
Four people died in the hours-long chaos, while one police officer died the day after battling rioters and four later died by suicide. Around 140 police officers were injured.
One of the officers at the scene, Sergeant Harry Dunn of the Capitol Police, said the attack took an emotional toll.
"You cannot get away from 6 January even if you're trying to. It's everywhere, especially if it's your place of work," he said in a phone interview. "Accountability needs to be had, no matter who that comes at."
Mr Biden's remarks will begin a day-long series of events that will also feature House of Representatives Speaker Nancy Pelosi and other legislative leaders, mostly from Mr Biden's Democratic Party. They will highlight the lingering damage from the worst attack on the Capitol since the War of 1812.
The House will not be in session and many Senate Republicans will be out of state attending the funeral of former Republican Senator Johnny Isakson.
Mr Biden said he will never let a US election be overturned, as he said Trump and his allies tried to do.
"I will stand in this breach. I will allow no one to place a dagger at the throat of democracy," he said. "We will make sure the will of the people is heard, that the ballot prevails, not violence."
Mr Trump remains highly popular among Republican voters. He has been shaping the field of Republican candidates who will contest the 8 November elections that will determine which party controls Congress and has repeatedly hinted he may run for the White House again in 2024.
Mr Biden warned that America is in crisis, with Mr Trump's lie that the election was stolen from him still embraced by millions, and Republican-led states enacting voting reforms widely seen as restrictions on people likely to vote Democratic.
"The former president and supporters have decided the only way for them to win is to suppress your vote and subvert our elections. It's wrong. It's undemocratic. And frankly, it's un-American," he said.
Today, Mr Trump cancelled plans to mark the anniversary with a news conference, where he had been expected to repeat his false claims. He plans to speak instead on 15 January at a rally in Arizona.
Most Republican officials and office holders have remained loyal to Mr Trump. Even after the attack, more than half of Republican politicians voted against certifying his defeat, and only a handful supported his impeachment.
Some have sought to play down the attack by likening the rioters to tourists and questioning whether the assault was perpetrated by federal agents.
"This wasn't a group of tourists. This was an armed insurrection," Mr Biden added. "They weren't looking to uphold the will of the people. They were looking to deny the will of the people."
Those who have called for accountability, including Representatives Liz Cheney and Adam Kinzinger, have been shunned by their colleagues. The two are the only Republicans participating in a congressional investigation that has interviewed more than 300 witnesses so far, including top Trump aides.
US prosecutors have brought criminal charges against at least 725 people linked to the riot, though so far they have not charged Mr Trump or his associates.
Democrats are using the anniversary to push a broad voting-rights bill that they say is needed to counteract Republican efforts to tighten laws at the state level. So far they have been unable to round up enough support to ensure passage in the Senate.
Mr Biden said the stakes could not be higher as America fights to preserve the rule of law and choose between democracy and autocracy, a battle he said was also playing out around the world.
"We are in a battle for the soul of America," he said. "A battle that by the grace of God, the goodness and greatness of this nation, we will win."
Republicans say Democrats are exploiting the event for partisan purposes.
"It is especially jaw-dropping to hear some Senate Democrats invoke the mob's attempt to disrupt our country's norms, rules, and institutions as a justification to discard our norms, rules and institutions themselves," Senate Republican Leader Mitch McConnell said in a statement.
