The military has activated about 700 active-duty Marines who could be sent to Los Angeles, joining National Guard troops who were sent to the city to respond to protests, U.S. Northern Command said in a statement.

The Marines and the National Guard personnel deployed amid the protests in to Los Angeles will operate under the same rules of force and will not be engaging crowds, according to two U.S. officials.

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.