Today, roughly 28 million Americans are uninsured, down from 41.3 million in 2013, due in large part to the Affordable Care Act, with its expansion of Medicaid, the creation of online health insurance marketplaces, the ability of young people to stay on their parents’ coverage through age 26, and the mandates that everyone purchase a health insurance plan.

In 2015, the Congressional Budget Office -- the nonpartisan number-crunching arm of Congress -- said that the number of additional Americans who would lose coverage or be unable to get it for the first time would start at 19 million in the first year and increase incrementally before leveling off to 24 million within a couple of years. (The incremental increases would stem from lags in when insurance options lapse as well as increases in the population from young people becoming old enough to secure insurance of their own.)