Update comes as California mounts lawsuit against US President Donald Trump’s deployment of the National Guard to respond to immigration protests.

The Pentagon will send a Marine battalion to Los Angeles in a major escalation of US President Donald Trump’s response to anti-immigration enforcement protests, the United States military has said.

The statement on Monday confirmed the “activation” of 700 Marines to help protect federal personnel and property in the California city, where Trump had deployed the US National Guard a day earlier.

The update came despite opposition from state officials, including California’s Governor Gavin Newsom, who had earlier mounted a legal challenge to the deployment of the National Guard troops.

In a statement, the military said the “activation of the Marines” was meant to help “provide continuous coverage of the area in support of the lead federal agency”.