US President Donald Trump has defended supporters of his for their alleged roles in recent deadly street clashes.
He suggested a teen accused of killing two in Wisconsin last week and Trump fans involved in clashes in Oregon on Saturday were acting in self-defence.
Mr Trump pointed out his Democratic White House challenger, Joe Biden, has not specifically disavowed far-left activists accused of civil disorder.
Mr Biden is leading in opinion polls ahead of November's election.
What did Trump say?
At Monday's White House news conference, Mr Trump blamed Mr Biden and his allies for violence in cities run by Democratic mayors and governors.
A CNN reporter asked the Republican president whether he would condemn supporters of his who fired paint pellets during a confrontation with counter-protesters at the weekend in Portland, Oregon.
In the ensuing street clashes, a member of a right-wing group, Patriot Prayer, was killed by a suspect who has reportedly described himself as a member of antifa, a loosely-affiliated network of mainly far-left activists.
On Monday, police named the man who was shot dead as Aaron Danielson. No arrest has been made.
"Well, I understand they had large numbers of people that were supporters, but that was a peaceful protest," Mr Trump replied to the CNN reporter, in an apparent veiled dig at US media outlets whom he has previously accused of ignoring violence at Black Lives Matter demonstrations.
"Paint as a defensive mechanism, paint is not bullets.
"Your supporters, and they are your supporters indeed, shot a young gentleman who - and killed him, not with paint, but with a bullet. And I think it's disgraceful."
Another reporter asked Mr Trump whether he would condemn a shooting in Kenosha, Wisconsin, allegedly by a teenager once pictured at one of the president's rallies.
Kyle Rittenhouse, 17, is accused of shooting three people, two fatally, last week amid demonstrations in the city over the police shooting of Jacob Blake.
"We're looking at all of that," Mr Trump said in his first public comments on the shooter, "that was an interesting situation, you saw the same tape as I saw, and he was trying to get away from them, I guess, it looks like. And he fell, and then they very violently attacked him.
"And it was something that we're looking at right now, and it's under investigation.
"I guess he was in very big trouble, he probably would have been killed."
Two Democratic congressmen pilloried Mr Trump for the remarks. Joe Kennedy III of Massachusetts tweeted: "This is the United States President justifying a double murder by a white man illegally carrying an assault rifle across state lines."
Kyle Rittenhouse, who has been charged as an adult, has not yet been brought to trial.
Representative Eric Swalwell of California tweeted that the president had just made Republicans "the Mass Shooter Party".
Lines drawn on law and order
Aleem Maqbool, BBC News, Kenosha
Throughout the summer, President Trump has referred to those taking to the streets across America as looters, rioters, anarchists and thugs. That is even though most of the demonstrations calling for an end to racial injustice, and to police brutality, have been peaceful.
But just as Democrats accuse the president of exploiting and even stoking the unrest for political gain, so Donald Trump's supporters accuse Democrats of the same thing.
"Our mayor is a Democrat, the governor is a Democrat, and the fact that they refused help early on just shows me that they were playing politics," one Trump supporter in Kenosha told me this evening.
In fact, the Wisconsin governor called in the National Guard the day after Jacob Blake was shot by a police officer in the city.
But with the aggressive messaging on law and order coming from the White House, the battle lines have been drawn on this issue - one we will be hearing much more of over the next nine weeks.
What did Biden say?
Earlier on Monday, Mr Biden forcefully condemned the violence at recent protests while blaming President Trump for making the country unsafe.
It was the Democratic nominee's most determined effort yet to counter Republican criticism that he is weak on law and order.
"Do I look like a radical socialist with a soft spot for rioters?" said Mr Biden, speaking in Pittsburgh, in the critical US election state of Pennsylvania. "Really?"
The former US vice-president accused Mr Trump of having fomented violence in the US for years.
"You know," said Mr Biden, "he may believe mouthing the words law and order makes him strong, but his failure to call on his own supporters to stop acting as an armed militia in this country shows how weak he is."
"Does anyone believe there will be less violence in America if Donald Trump is re-elected?" he asked.
The Democratic nominee took no questions from the media.
Mr Biden's remarks represented a pivot from his main line of attack so far - that the White House has mishandled its response to the coronavirus pandemic, which has killed more than 180,000 people in the US.
What has Biden previously said?
Mr Biden has previously spoken out against violent protests a number of times between May and July, according to a Washington Post fact-check.
Democrats hardly touched on the issue during their convention from 17-20 August, focusing instead on racial justice and African-American victims of police brutality. Rioting and looting was a central theme of the Republican convention a week later.
Since the shooting of Jacob Blake in Wisconsin on 23 August reignited civil strife, Mr Biden and his campaign have renewed their criticism of violence at demonstrations.
According to the Associated Press news agency, Mr Biden has been prodded by anxious Democrats - including within his campaign - to be more vocal in denouncing protest-related violence.
Research by Marquette University Law School in Milwaukee, Wisconsin, on 11 August found support for the racial justice protests has fallen 13 percentage points, and for Black Lives Matter by 10 points, from June to August.
Wisconsin - which was pivotal in Mr Trump's against-all-odds election victory four years ago - is a must-win state for Democrats in November.
Source : BBC