Documents withheld from the public include letters between Kerry and P5+1 counterparts.

Among the 18 documents pertaining to the Iran nuclear deal that the Obama administration handed out to lawmakers in Washington in accordance with the Iran Nuclear Agreement Review Act, several remain withheld from the public despite their not being classified, The Daily Beast reported on Friday.

A document that describes how sanctions against Iran could be handled during “the interim period” as well as one describing the R&D of Iran’s nuclear program have both been kept from the public, the Daily Beast said.

A letter from the foreign ministers of Germany, France and the U.K. to Secretary of State John Kerry and a letter from Kerry to those three and his Chinese counterpart were also among the 18 documents, and are also being withheld.

Even a draft statement to be delivered by the U.S. the day the deal would be implemented is too sensitive for the public to see.

The documents that can be shared with members of Congress but not the public are being held in Sensitive Compartmentalized Information Facilities, where anyone with sufficient access can see them. But the documents can neither be removed from these facilities nor shared between lawmakers and trusted colleagues or experts, said Steven Aftergood, a senior research analyst at the Federation of American Scientists.