For those saying it's Un-American Socialism... they said the same thing about Social Security.
Do you dispute that this is socialism?
There's 2 views...
1. There's the broad view that would include Social Security as socialism, as well as most government programs created since 1860.
2. There's the view that it can only be Socialist if it's about communal democratic ownership of the means of production.
If you go with view #1, you'll find that a supermajority of Americans are already socialist for supporting the existence of Social Security and like-minded programs.
If you go with view #2, no, single-payer has nothing to do with owning the means of production.
(And most countries that would be identified as capitalist, like the UK and Canada, have a version of single-payer healthcare.)