"Medicare-for-all" can mean different things to different people.
For some, it's a single government-run health insurance plan for the whole country. To others, it's giving consumers a choice to buy into Medicare or keep their private insurance.
But whatever the form, the proposals are built on the premise that health insurance should be a guaranteed right.
Sen. Bernie Sanders, a Vermont independent seeking the 2020 Democratic presidential nomination, launched the debate over "Medicare-for-all." Now, other Democratic presidential hopefuls are staking out their positions on the concept, which President Donald Trump decries as socialism.