EPA
It is billed as a policy "wish list" for the next Republican president that would vastly expand presidential powers and impose an ultra-conservative social vision on the US.
Donald Trump has disavowed the Heritage Foundation's Project 2025 document, though many of its authors worked for his previous administration.
Links between the Trump campaign and Project 2025 have been highlighted by the former president's critics, and this attack line will likely continue at the Democratic National Convention in Chicago this month.
Here's your guide to what the document contains.
Who wrote Project 2025?
It is common for Washington think tanks of all political stripes to propose policy wish lists for potential governments-in-waiting.