Millions of Americans who rely on health plans under the Affordable Care Act could see their premiums increase, with some potentially losing their insurance altogether, if Congress doesn’t extend key tax credits. The enhanced tax credits were expanded during the pandemic to make health insurance more affordable for people who buy ACA plans. More than 20 million people enrolled in marketplace plans in 2024, and most of them receive these credits. PBS News Hour's William Brangham spoke to KFF's Cy