Calling President Trump a threat to the American way of life, Governor Gavin Newsom depicted the federal military intervention in Los Angeles as the onset of a much broader effort by Trump to overturn political and cultural norms at the heart of the nation’s democracy.

The protests began Friday after Immigration and Customs Enforcement agents carried out coordinated raids across Los Angeles, detaining dozens of workers at warehouses and other worksites. The arrests sparked immediate backlash, with demonstrators converging outside federal buildings, blocking freeways, and in some cases clashing with police.