By Dietrich Knauth and Jack Queen

(Reuters) -A landmark trial kicks off on Monday over the Trump administration’s use of National Guard troops to support its deportation efforts and quell protests in Los Angeles, in a legal challenge highlighting the president’s break from long-standing norms against deploying soldiers on American streets.

The three-day non-jury trial before U.S. District Judge Charles Breyer in San Francisco will determine if the government violated a 19th-century law that bars the military from civil law enforcement when it deployed troops to Los Angeles in June.

Los Angeles suffered days of unrest and protests sparked by mass immigration raids at places where people gather to find work, like Home Depot stores, a garment factory and a warehouse.

The administration de

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