Cal. Elec. Code § 6852

On or before the 120th day preceding a presidential primary election, the Secretary of State shall publicly announce and distribute to the news media for publication a list of the candidates she or he intends to place on the ballot at the following presidential primary election. Following this announcement, the Secretary of State may add candidates to her or his selection, but she or he may not delete any candidate whose name appears on the announced list. The Secretary of State shall mail a copy of the list and any subsequent additions to the list to the Green Party Liaison to the Secretary of State.