"The Intercept on Wednesday published the U.S. government's 166-page rulebook that guides the creation of its famous internal "terrorist watchlist."

Both the Bush and Obama administrations have resisted spelling out how individuals, including its own citizens, wind up on the list, or how they can be removed.
[...]
In order to make the watchlist, neither "concrete facts" nor "irrefutable evidence" are required, and a wide loophole exists that allows a single White House official to add entire "categories" of people unilaterally "