Clinton strongly favors the Affordable Care Act. She wants to build on it in several ways, however, extending tax credits, making more people eligible for exchanges and Medicare, and tackling prescription drug prices.

Though Trump has broken with conservatives of his own party on many issues, his health-policy positions are largely in line with GOP orthodoxy. He wants to end the Affordable Care Act. He also wants to transform Medicaid into state block grants, create high-risk insurance pools for people who need a lot of medical care and permit insurance to be sold across state lines.

At think tanks and elsewhere, health policy experts have assessed the overall impact of the Clinton and Trump plans on the number of Americans with insurance and on federal spending. While the numbers vary, all conclude that her proposal would increase coverage and his would diminish it. Analyses disagree, though, on the impact of their plans on the federal deficit.