Milwaukee police shooting

The killing of Sylville Smith, which took place in a predominantly African-American part of Milwaukee on Saturday, led to several days of protests.

"We have to obey the laws or we don't have a country," Mr Trump told Fox News after visiting police in the city.

A string of fatal police shootings have sparked demonstrations across the US.

Protesters say the police are too ready to use lethal force against African Americans.

In the latest incident on Saturday, 23-year-old Mr Smith was stopped by police and then fled.

Family and friends of Sylville Smith, 23, held a candlelight vigil at the site of Saturday's shooting in a residential area of North Milwaukee.

The shooting triggered unrest in the city's north side Saturday night as protesters torched businesses and threw rocks at officers. Four officers were injured and 17 people were arrested, Mayor Tom Barrett said.

Tensions on Sunday gave way to calls for peace as activists gathered outside the affected businesses.