The Pentagon is ending the deployment of all but 250 National Guard troops that remained in Los Angeles who were originally sent to the city to deal with protests over the Trump administration’s immigration crackdown.

A federal judge in San Francisco will hear arguments on whether military troops deployed this summer by the Trump administration to Los Angeles violated a federal law that bars troops from conducting law enforcement duties within the country.

Three-day trial will determine if the government violated a 19th century law that bars the military from civil law enforcement

Maj. Gen. Scott Sherman testified Tuesday at a trial to determine whether the Trump administration violated federal law when it deployed the soldiers and U.S. Marines to Southern California this summer.

In New Mexico’s most populous city, National Guard troops are listening to the police dispatch calls, monitoring traffic cameras and helping to secure crime scene perimeters, tasks not usually part of the job.