The Obama administration has quietly approved a substantial expansion of the terrorist watchlist system, authorizing a secret process that requires neither "concrete facts" nor "irrefutable evidence" to designate an American or foreigner as a terrorist, according to a key government document obtained by The Intercept.

The "March 2013 Watchlisting Guidance," a 166-page document issued last year by the National Counterterrorism Center, spells out the government's secret rules for putting individuals on its main terrorist database, as well as the no fly list and the selectee list, which triggers enhanced screening at airports and border crossings. The new guidelines allow individuals to be designated as representatives of terror organizations without any evidence they are actually connected to such organizations, and it gives a single White House official the unilateral authority to place "entire categories" of people the government is tracking onto the no fly and selectee lists. It broadens the authority of government officials to "nominate" people to the watchlists based on what is vaguely described as "fragmentary information." It also allows for dead people to be watchlisted.

Over the years, the Obama and Bush Administrations have fiercely resisted disclosing the criteria for placing names on the databases—though the guidelines are officially labeled as unclassified. In May, Attorney General Eric Holder even invoked the state secrets privilege to prevent watchlisting guidelines from being disclosed in litigation launched by an American who was on the no fly list. In an affidavit, Holder called them a "clear roadmap" to the government's terrorist-tracking apparatus, adding: "The Watchlisting Guidance, although unclassified, contains national security information that, if disclosed … could cause significant harm to national security."