The proposed "Calexit" initiative - its name borrowed from the UK's "Brexit" departure from the EU - would ask voters to repeal part of the state constitution that declares California an inseparable part of the U.S.
A recent poll found that one in three California residents would support a possible secession from the U.S. due to their opposition to President Trump. No mention has been made of the president in the proposal.
If the proposal qualifies for the ballot and is approved by voters, it could be a step to a future vote on whether the state would break away from the rest of the nation.