President Donald Trump and Democratic rival Joe Biden have been accusing one another over violence that has erupted at protests in Portland, Oregon.
A man linked to a right-wing group was killed on Saturday, as elsewhere in the city a pro-Trump rally clashed with Black Lives Matter protesters.
Trump called participants of the rally “great patriots” and blamed the city’s Democratic mayor for the unrest.
But Biden accused the president of encouraging the violence.
Ahead of a campaign speech in the city of Pittsburgh on Monday, the Democratic candidate said he would “lay out a core question voters face in this election: are you safe in Donald Trump’s America?”
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Portland has become a flashpoint for demonstrations against police brutality and racism since the police killing of African-American George Floyd in Minneapolis on 25 May triggered a wave of national and international outrage.
Media reports say a man who calls himself an anti-fascist is being investigated over Saturday’s deadly shooting, while the founder of the right-wing group Patriot Prayer identified the victim as a supporter.
Trump on Sunday re-tweeted what appeared to be the dead man’s name along with the message “Rest in Peace”.
Police have not publicly named the suspect or the victim, or specified whether the shooting was directly linked to the clashes.
The president is set to visit the city of Kenosha, Wisconsin, on Tuesday amid anger there over the police shooting of black man Jacob Blake.