Re: So the USA will save $800M
The papers will most likely be available to general public regardless of the readers nationality, except for may those will national security implications. While many research paper are published by the university, government publications usually either are public domain or ironically copyrighted similar to Creative Commons.
I think there is some US code that defines all this, and this is a bit all second-hand and from personally working in the US government but not really involved in the publication of information.