However, protections for preexisting conditions are already the law, and Trump would have to go to Congress to cement a new policy through legislation.
In the first presidential debate, the US President also held out the repeal of Obamacare's individual mandate to have health insurance as significant progress, while ignoring questions about his lack of a comprehensive plan.
The Democratic presidential nominee wants to expand Obama's law to provide more generous coverage to a greater number of people and add a “Medicare-like public option” that would compete with private insurers and be available to working-age Americans.
Joe Biden estimates that would cost about $750 billion over 10 years.
That positions Biden between Trump, who wants to scrap the 2010 law, and progressives, who want a single-payer system to replace private insurance altogether.
Biden sees his approach as the next step toward universal coverage and one he could get through Congress.
The Democratic presidential nominee also has sought to turn the current Supreme Court vacancy into a healthcare matter, noting that the late liberal Justice Ruth Bader Ginsburg was a key vote in upholding the 2010 health care law.
Meanwhile Trump's nominee, federal appellate Judge Amy Coney Barrett, has criticized the court's reasoning in that decision.
Trump vs Biden Policies 2020: Coronavirus