The "American Citizens First Act" aims to significantly alter immigration and citizenship policies by restricting access to federal benefits and expanding removal authorities. It proposes to terminate eligibility for all Federal public benefits for noncitizens, encompassing welfare, Medicaid (excluding emergency services), food stamps, housing assistance, federal student aid, and refundable tax credits. The bill also introduces new grounds for denaturalization , allowing for the expedited removal of naturalized citizens who are convicted of or credibly found to have participated in riots, violent protests, or acts intended to disrupt the constitutional order. Furthermore, it expands expedited removal authority to apply to any alien not lawfully admitted or paroled, regardless of their time in the United States, with very limited exceptions. A key provision mandates a comprehensive security review for Afghan nationals admitted or paroled since January 20, 2021, suspending new processing and resettlement funds until the review is certified. Finally, the bill establishes an automatic termination mechanism for Temporary Protected Status (TPS) if country conditions no longer warrant it, or if the crime rate among nationals of a designated country exceeds the national average by at least 20 percent, applying retroactively to recent designations.