The revelation on Wednesday newly riled Republican lawmakers in the U.S. who have been severely critical of a broader agreement to limit Iran's future nuclear programs, signed by the Obama administration, Iran and five world powers in July. Those critics have complained that the wider deal is unwisely built on trust of the Iranians, while the administration has insisted it depends on reliable inspections.

A skeptical House Speaker John Boehner said, "President Obama boasts his deal includes `unprecedented verification.' He claims it's not built on trust. But the administration's briefings on these side deals have been totally insufficient - and it still isn't clear whether anyone at the White House has seen the final documents.