Gavin Newsom says the federal military intervention in Los Angeles marks the onset of a much broader effort by President Donald Trump to overturn political and cultural norms.

The dare and double-dare between Newsom and the Trump administration comes after the president ordered the National Guard into Los Angeles.

Their carefully calibrated truce, forged in the wake of January’s devastating wildfires across Los Angeles, appeared to implode over the weekend when Trump sent the California National Guard into the city against Newsom’s wishes to quell immigration enforcement protests.

Officers used tear gas and batons to disperse crowds in the Paramount district. US President Donald Trump has said 2,000 National Guardsmen would be deployed to California to deal with the protests, which were sparked by raids targeting undocumented migrants.

Protests are scheduled in California and nationwide on Saturday, June 14. Here's what experts say to know and pack if you go.

In a letter to school district superintendents Friday, the California Department of Education, or CDE, appeared to question the authority of the federal government to take such an action.

California has challenged the administration's move to call up the National Guard over the objections of Governor Gavin Newsom.