U.S. President Donald Trump can keep his deployment of National Guard troops in Los Angeles, according to a court ruling, as protests against immigration raids look set to enter their second week in the strongest backlash since his return to power in January.

Almost 5,000 National Guard troops and Marines have been assigned to Los Angeles — drawing stiff rebukes from state officials.

Police arrested more than 20 people, mostly on curfew violations, on the first night of restrictions in downtown Los Angeles.

Los Angeles endured a sixth day of protests that have been largely peaceful but occasionally punctuated by violence.

Trump’s trip comes as he faces criticism over deploying military in an attempt to quell immigration protests in Los Angeles.

The Guard’s arrival marks a potentially volatile phase in Trump’s push to ramp up deportations and in his contentious relationship with state and local authorities.