[6] Prominent legal scholar and UC Berkeley School of Law Dean Erwin Chemerinsky argued in support of the constitutionality of Senate Bill 27.

The Trump re-election campaign, the California Republican Party, and Judicial Watch all filed lawsuits challenging the constitutionality of the law.

[6][8] On September 19, 2019, U.S. District Judge Morrison England issued a temporary injunction against enforcement of the law with a promise for a final ruling by the end of the month.

[13] After the close of the filing deadline, one candidate, Larry Elder, sued after Weber disqualified his candidacy due to purported errors in his submitted documents, saying the law required her to allow for the correction of those errors, and that the tax disclosure requirement in SB 27 did not even apply to recall elections.

[14] Sacramento County Superior Court Judge Laurie Earl agreed, saying Elder had been improperly disqualified and invalidated application of the law to recall elections; by that time, the tax returns for over 40 replacement candidates had already been made public by Weber's office.