You need to actually read your source. The Trump supporters “clashed with protestors”, not rioted.
“It wasn’t clear if the shooting was linked to fights that broke out as a caravan of about 600 vehicles was confronted by protesters in the city’s downtown”
According to your own source, the people who rioted were BLM protestors, not Trump supporters.
“The Black Lives Matter demonstrations usually target police buildings and federal buildings. Some protesters have called for reductions in police budgets while the city’s mayor and some in the Black community have decried the violence, saying it’s counterproductive.
Early Saturday morning, fires set outside a police union building that is a frequent site for protests prompted police to declare a riot.”