They will do anything to keep Trump from being re-elected.
If fully passed into law, California Senate Bill 27 would enact the Presidential Tax Transparency and Accountability Act, requiring every presidential candidate to file income tax returns for the previous five years with California's secretary of State in order to have their name appear on a primary election ballot. The state's secretary of State would then release a redacted version of the candidate's tax returns to the public within five days of the initial filing date. If passed by the California State Assembly and signed into law by Gov. Gavin Newsom, the bill would take effect immediately, thus impacting the 2020 presidential elections.
https://www.bustle.com/p/californias-2020-ballot-may-exclude-trump-if-he-doesnt-release-his-tax-returns-17298934