SAN FRANCISCO — A deputy commanding general testified Monday that military forces called in to assist with immigration raids in Los Angeles were allowed to take some law enforcement actions despite a federal law that prohibits the president from using the military as a domestic police force.

Maj. Gen. Scott Sherman stated that military tapped to assist with domestic operations can protect federal property and federal agents in their mission carrying out federal operations. He mentioned they could undertake certain law enforcement actions, such as setting up a security perimeter outside of federal facilities, if a commander on the ground felt unsafe.

Sherman testified at the start of a three-day trial regarding whether President Donald Trump’s administration violated the 1878 Posse Comitatus Act by deploying National Guard soldiers and U.S. Marines to Los Angeles following June protests over immigration raids. The act generally restricts the military from engaging in civilian law enforcement. Trump has pushed the traditional bounds of military activity on domestic soil, also seen in the creation of militarized zones along the U.S.-Mexico border.

MORE: Another 1,350 National Guard troops being withdrawn from Los Angeles, Pentagon says

On Monday, Trump announced he was deploying the National Guard across Washington, D.C., and taking over the city’s police department in an attempt to reduce crime, despite the mayor’s note that crime is declining in the nation’s capital.

The trial in San Francisco could set precedent for how Trump can deploy the guard in the future in California or other states.

The Trump administration federalized California National Guard members and dispatched them to the second-largest U.S. city against the objections of Democratic Gov. Gavin Newsom and city leaders after protests started June 7 when Immigration and Customs Enforcement officers arrested individuals at multiple locations.

The Department of Defense ordered the deployment of approximately 4,000 California National Guard troops and 700 Marines to Los Angeles. Most of the troops have since departed but 250 National Guard members remain, according to the latest data provided by the Pentagon.

California is asking Judge Charles Breyer to order the Trump administration to return control of the remaining troops to the state and to stop the federal government from using military troops in California “to execute or assist in the execution of federal law or any civilian law enforcement functions by any federal agent or officer.”

Newsom won an early victory from Breyer, who found the Trump administration violated the Constitution’s 10th Amendment, which defines power between federal and state governments, and exceeded its authority.

The Trump administration immediately appealed, arguing that courts can’t second guess the president’s decisions. It secured a temporary halt allowing control of the California National Guard to stay in federal hands as the lawsuit unfolds.

After their deployment, the guard members accompanied federal immigration officers on raids in Los Angeles and at two marijuana farm sites in Ventura County while Marines mostly stood guard around a federal building in downtown Los Angeles that includes a detention center at the core of protests.

Since June, federal agents have rounded up immigrants without legal status to be in the U.S. from Home Depots, car washes, bus stops, and farms. Some U.S. citizens have also been detained.

Trump federalized members of the California National Guard under a law allows the president to call the National Guard into federal service when the country “is invaded,” when “there is a rebellion or danger of a rebellion against the authority of the Government,” or when the president is otherwise unable “to execute the laws of the United States.”

Breyer found the protests in Los Angeles “fall far short of ‘rebellion.'”

Ernesto Santacruz Jr., the field office director for the Department of Homeland Security in Los Angeles, said in court documents that the troops were needed because local law enforcement was slow to respond when a crowd gathered outside the federal building to protest the June 7 immigration arrests.

“The presence of the National Guard and Marines has played an essential role in protecting federal property and personnel from the violent mobs,” Santacruz said.