The dramatic escalation came a week after the death in Minneapolis of George Floyd, an unarmed black man who was killed when a white police officer knelt on his neck, leading to the worst civil unrest in decades in New York, Los Angeles and dozens of other American cities.
In the Midwest, police were early Tuesday trying to bring the city of St Louis under control after a night of looting and violence in which four officers were shot, police chief Colonel John Hayden said, adding their injuries were not life-threatening.
“Mr Floyd was killed somewhere else and they’re tearing up cities all across the country,” a visibly emotional Hayden said.
“I am dispatching thousands and thousands of heavily armed soldiers, military personnel and law enforcement officers to stop the rioting, looting, vandalism, assaults and the wanton destruction of property,” Trump said.
He slammed the previous night’s unrest in Washington as a “total disgrace” and called on governors to “dominate the streets.”
Despite the president’s rhetoric, Monday’s protests appeared largely peaceful in major cities, though some looting was reported in New York and Los Angeles.
During his address, however, law enforcement including military police used tear gas to clear protesters outside the White House so the president could walk across the street to the two-centuries-old St John’s church, hit with graffiti and partially damaged by fire during unrest on Sunday.