Minnesota Murder

He said if cities and states failed to control the protests and "defend their residents" he would deploy the army and "quickly solve the problem for them".

Protests over the death of George Floyd are entering their seventh day.

As Mr Trump spoke at the White House, police cleared protesters from a nearby park with tear gas and rubber bullets.

The president then crossed the park and posed next to a damaged church, provoking widespread criticism from those who accused him of aggressively targeting the peaceful demonstrators in aid of a photo opportunity.

Minnesota Governor Tim Walz said the deployment was needed because outsiders were using the demonstrations over the death of George Floyd to spread chaos, and that he expected Saturday night's protests to be the fiercest so far.

From Minneapolis to New York City, Atlanta and Washington, protesters clashed with police late on Friday in a rising tide of anger over the treatment of minorities by law enforcement.

"We are under assault," Walz told a briefing. "Order needs to be restored. ... We will use our full strength of goodness and righteousness to make sure this ends."

Omar Jimenez was led away in handcuffs while he was live on air early on Friday. His cameraman and producer were also detained, apparently because they did not move on when told.

They were released without charge.

Minnesota governor Tim Walz has apologised, describing the incident as "unacceptable".

CNN said the arrests violated the constitution.

Derek Chauvin, who is white, was shown in footage kneeling on 46-year-old George Floyd's neck on Monday. He and three other officers have been sacked.

Days of looting and arson in the Minnesota city have boiled over into nationwide protests.

The case has reignited US anger over police killings of black Americans.

Hennepin County Prosecutor Mike Freeman said Mr Chauvin was charged with third-degree murder.

He said he "anticipates charges" for the three other officers but would not offer more details.