In the 2016 election, Republicans and their presidential nominee Donald Trump vowed to repeal and replace Obamacare, the landmark federal health care law passed by Democrats in 2010. They very nearly did it.
But after the bill stalled in the Senate, no comprehensive package emerged.
Health care remains a deeply divisive battleground, with claims and criticisms flying from both sides. A key stumbling point is affordable guaranteed coverage, regardless of any pre-existing condition. Current law offers an ironclad guarantee. Republican proposals have included escape hatches that fall short of matching it.
The makeup of the insurance market is in flux, as the Trump administration rolls out administrative rules that allow carriers to sell different types of plans. The variety increases consumer choices, but analysts warn it would split the market and drive up costs for older and sicker consumers.