California is an “At-Will” Employment State. You can be hired, or fired for any non-illegal reason.
California Legislative Information: https://leginfo.legislature.ca.gov/faces/codes_displayText.xhtml?lawCode=LAB&division=3.&title=&part=&chapter=2.&article=4.
March 2019
Resources:
California Legislature:
https://leginfo.legislature.ca.gov/faces/codes_displayText.xhtml?lawCode=LAB&division=3.&title=&part=&chapter=2.&article=4.