If you've been following the long slog that is the Democratic primaries, chances are you'll have heard the phrase "Medicare for All" by now.
But what exactly is it, and would it really work in practice?
In the Last Week Tonight video above, John Oliver breaks all that down — and he has some strong words for the people who criticise it.
"I shit on Britain a lot on this show, and I'm not going to stop anytime soon. But one thing Britain does well is the National Health Service," Oliver says.
"I'll be honest with you, I've never had a bad experience, and I don't know anyone who has. But, since moving to America, I don't think I've met anyone who doesn't have at least one insurance industry horror story." Read more...More about John Oliver, Last Week Tonight, Medicare For All, Entertainment, and Health