A federal judge in San Francisco is weighing whether the Trump administration violated federal law by sending National Guard troops to accompany federal agents on immigration raids in Southern California.

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

A federal trial is underway to determine the legality of President Donald Trump's federalization of the National Guard in Los Angeles to quell protests against local Immigration and Customs Enforcement operations in June.

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.

A general testified that National Guard troops repeatedly rehearsed their role in an operation at a Los Angeles park intended as a show of force against people protesting immigration raids.

President Trump's military interventions in Los Angeles and Washington, D.C., foretell his plan for other cities. The Washington Post recently reported on the Pentagon's plans for a "quick reaction force" to deploy amid civil unrest.