evidence: More than 21 million people have signed up for health plans through the Affordable Care Act’s health insurance marketplaces, the Biden administration announced Wednesday. The record level of enrollment comes as former president Donald Trump, seeking the GOP nomination, is again vowing to repeal the program if elected. Sign-ups in the health insurance marketplaces — a jump of 5 million since last year and the third straight year of record enrollment — were partly driven by states "unwinding" pandemic-era protections in Medicaid, with millions of people culled from the safety net health program, said Biden officials and outside researchers. The enrollment figures reflect a roughly 80 percent surge in sign-ups for the ACA since President Biden took office in 2021 and expanded the subsidies available to consumers. [...] Under Biden, health plans in the Affordable Care Act have become more affordable. The American Rescue Plan Act of 2021, or ARPA, contained provisions that expanded the number of people who were eligible for Affordable Care Act health plan subsidies by about 20 percent, and the Inflation Reduction Act of 2022 extended those subsidies.