According to the Los Angeles Times:
Gov. Jerry Brown signed a closely watched bill on Sunday to block the creation of any so-called Muslim registry should President Trump choose to act on a proposal he repeatedly suggested during his 2016 campaign. Dubbed the California Religious Freedom Act, the bill coasted through the legislative process this year, the only proposal to gain bipartisan support from a package introduced by majority Democrats to counter Trump’s policies.
In authoring the bill, Sen. Ricardo Lara (D-Bell Gardens) cited an NBC News interview in which Trump, then a presidential candidate, said there “should be a lot of systems,” beyond a database, that track Muslims in the country. As evidence the president could follow through on that idea, supporters of SB 31 pointed to the creation of travel bans from seven predominantly Muslim countries.