The demonstrators defied the authorities' attempt to restore order, throwing bottles at one another and using pepper spray in the city's downtown area.
Charlottesville mayor Michael Signer blamed Mr Trump for inflaming racial prejudice during his presidential campaign last year.
Trump said: "We ALL must be united & condemn all that hate stands for". He has been venerated as a heroic figure in the South.
So far three people have died in the riots. Both political officials and regular citizens criticized Trump for not directly and vehemently condemning the actions of the white nationalist groups whose presence caused the violence. A banner spray pained with "Black Lives Matter" was hung from Parkman Bandstand, a famous landmark in the city.
Although a few cars were held up by the march, police said the rally was peaceful and there were no arrests. "Sometimes, the left maybe throws around this racism title so much that they diminish when something really truly racist and evil happens like it did today".
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