Floyd died on May 25 shortly after four police officers arrested him in Minneapolis.
His death caused outrage across a nation that is politically and racially divided during a polarizing presidential campaign, and has recently been released from strict stay-at-home orders during the coronavirus pandemic that threw millions out of work.
Authorities imposed curfews in the capital Washington and other major U.S. cities to prevent fresh rioting after anti-racism protesters again took to the streets to voice their fury at police brutality.
The president reportedly clashed with Illinois' Democratic Gov. J.B. Priztker, who confronted Trump about his comments during the crisis.
City and state officials deployed thousands of National Guard soldiers, enacted strict curfews and shut down mass transit systems to slow protesters' movements, but that did little to stop parts of many cities from again erupting into mayhem.
Politicians have also taken aim at the Trump administration, with Rep. Lori Trahan accusing the president of having "turned the lights off and turned his back" on US residents. Mayor Lori Lightfoot told a news conference Monday police fielded more than 30,000 calls Sunday, at times 2,000 calls in 30-minute periods.
"They keep killing our people", said Mahira Louis, 15, who marched with her mother and several hundred others in a peaceful protest through downtown Boston.
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Video showed white police officer Derek Chauvin kneeling on a handcuffed Floyd's neck for more than eight minutes. It was hours ago when Smith took to social media to warn people that above video would surface.
Demonstrators returned Sunday afternoon, facing off against police at Lafayette Park into the evening.
A Molotov cocktail hits a police auto during a protest in Ferguson, Missouri, on May 31, 2020.
Police launched tear gas and rubber bullets at crowds, while some protesters set fire to buildings and vandalised monuments.
While there was no immediate repeat of the large-scale violence that has rocked cities in recent days, looters ransacked stores in a neighbourhood of Philadelphia. The officer, Derek Chauvin, has been charged with murder.
Black Lives Matter protest planned for city
The protests were sparked just hours after a former Minneapolis police officer was arrested and charged with his murder. Outcry over George Floyd's death has gone worldwide , with demonstrators taking to the streets in London and Berlin.
Boston police tweeted that at least 40 people had been arrested as of 3 a.m. Monday.
The White House, meanwhile, has largely ignored the issue of police brutality, with the president instead taking actions to protect himself and lashing out on social media to cast blame toward his political adversaries.
De Blasio said he had not seen a separate video showing an officer pulling down the mask of a black protester to spray something in his face. DeWine mobilized the National Guard to both Cleveland and Columbus to aid the police response.
The president held a call with officials on Monday morning, after a week of protests and riots around the US.
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So we'll get back when we're told to and until then it is sit tight, get fit", stated Smith. So we'll wait and see where everything lands", he added.