Los Angeles unrest marks latest clash of US presidents, states over National Guard
California governor calls Trump’s National Guard deployment to Los Angeles unlawful, the ‘acts of a dictator’
By ordering 2,000 guardsmen to Los Angeles to help quell protests against raids by US immigration agents, Trump essentially mounted a takeover of the state’s military regiments to address “lawlessness” on the city’s streets.
The National Guard is a reserve military rooted in the 17th century local militias created in the American colonies before the country’s founding.
Since then the guard has had multiple responsibilities: domestic disaster relief and security, homeland defence and prevention of civil unrest; and acting as reserve forces for US military deployments overseas.

Presidential orders to deploy guardsmen domestically were not uncommon.