• Trump sent Guard troops and Marines to Los Angeles
• California challenges legality of use of Guard troops

Aug 11 (Reuters) - A landmark trial kicks off on Monday over the use by Donald Trump’s administration of National Guard forces to support its deportation efforts and quell protests in Los Angeles, in a legal challenge to the U.S. president’s break from long-standing norms against deploying troops on American streets.

The three-day non-jury trial before San Francisco-based U.S. District Judge Charles Breyer will determine if the government violated a 19th century law that bars the military from civil law enforcement when Trump deployed the troops in June, as the state of California claims in its legal challenge.