Maj. Gen. Scott Sherman, speaking in an interview with The Associated Press and one other media outlet, said that as of Wednesday about 500 of the Guard troops have been trained to accompany agents on immigration operations. Photos of Guard soldiers providing security for the agents have already been circulated by immigration officials.
Sherman is commander of Task Force 51, which is overseeing the Guard troops and Marines sent to Los Angeles. The ruling does not apply to the Marines.
Typically the authority to call up the National Guard lies with governors, but there are limited circumstances under which the president can deploy those troops. Trump federalized members of the California National Guard under an authority known as Title 10.
Title 10 allows the president to call the National Guard into federal service under certain limited circumstances, such as 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 unable "to execute the laws of the United States."
Breyer said in his ruling that what is happening in Los Angeles does not meet the definition of a rebellion.