Per their mutual agree in the wake of the P5+1 nuclear agreement, Iran has provided the IAEA with a collection of information related to their previous nuclear activities, one of the important conditions of the agreement to resolve the IAEA’s questions.
The IAEA confirmed the receipt of the documents, though as they have made a confidentiality agreement with Iran, the contents of much of them are not expected to ever be made public, and will likely just be summarized in future reports.
That’s not sitting well with US Congressional hawks, who were hoping the documents would provide new dirt on Iran to try to undermine the nuclear deal. Sen. Lindsey Graham (R – SC) is leading an effort to defund the IAEA outright to punish them for not “sharing” the information with Congress.
Iran is believed to have had a fledgling nuclear weapons program in the best, though all intelligence agencies agree it’s been long-since abandoned. How far that program progressed before being scrapped remains a matter of considerable speculation, however.