The party split in Congress is so slim that, even with Democrats technically in the majority, passing major health care legislation will be extremely difficult. So speculation about President-elect Joe Biden's health agenda has focused on the things he can accomplish using executive authority. Although there is a long list of things he could do, even longer is the list of things he is being urged to undo — actions taken by President Donald Trump.

While Trump was not able to make good on his highest-profile health-related promises from his 2016 campaign — including repealing the Affordable Care Act and broadly lowering prescription drug prices — his administration did make substantial changes to the nation's health care system using executive branch authority. And many of those changes are anathema to Democrats, particularly those aimed at hobbling the ACA.

For example, the Trump administration made it easier for those who buy their own insurance to purchase cheaper plans that don't cover all the ACA benefits and may not cover pre-existing conditions. It also eliminated protections from discrimination in health care to people who are transgender.