US President Donald Trump has visited Kenosha, Wisconsin, to back law enforcement after the police shooting of a black man sparked civil strife.

The Republican president blamed "domestic terror" for the "destruction" in the Midwestern city.

Kenosha saw days of violence after police shot Jacob Blake in the back and left him paralysed on 23 August.

Opinion polls show Mr Trump is narrowing Democratic rival Joe Biden's lead ahead of November's election.

The president is pushing a strong "law and order" message. Mr Biden has accused Mr Trump of stoking racial division.

"Fires are burning and we have a president who fans the flames rather than fighting the flames," the former US vice-president said ahead of Tuesday's trip.