Republican lawmakers have opened a new avenue of attack on the Iran nuclear accord by criticizing what they call "secret side deals" governing the inspection process that will be withheld from Congress.

Confidential agreements between Iran and the International Atomic Energy Agency, which will inspect Iran's nuclear facilities, emerged as a key point of contention with Republicans at a hearing Wednesday of the Senate Armed Services Committee.

Administration officials said such agreements are standard procedure for international inspections, while critics said the pacts add a layer of secrecy to a deal that's raised national security concerns.