California Attorney General Rob Bonta said Monday that he’ll soon file a lawsuit against the Trump administration for federalizing National Guard troops this weekend.

A large crowd gathered Monday in a park across from Los Angeles City Hall to protest the arrest of a prominent labor leader. Their signs lambasted President Trump and Immigration and Customs Enforcement as David Huerta was due in court for a bail hearing. Union leaders from across California led the crowd in chants of “Free Huerta now!”

In announcing the lawsuit, Attorney General Rob Bonta called the president's move to federalize the National Guard an "infringement" on state sovereignty.