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This study examines the chilling effects of the Trump administration's 2019 public charge rule on Medi-Cal enrollment and healthcare access among immigrant populations in California. Using CHIS data from 2015 to 2024, we estimate multi-group difference-in-differences models comparing noncitizens (distinguished by green card status using confidential data), naturalized citizens, and U.S.-born citizens before and after the September 2018 announcement. The CHIS analysis supports a primary national analysis using ACS data showing that U.S. citizen children in mixed-status families experienced a 2.0 percentage point decline in Medicaid enrollment. We test whether effects varied by documentation status, county-level immigration enforcement intensity, and whether they persisted after the 2022 reversal.