The debate over Iran's potential agreement with the United States has spilled beyond the country's political class and into the religious establishments and street gatherings that have long served as the Islamic republic's most loyal base of support.

Factional divisions and opposition to talks with the United States exist within the Iranian hierarchy, but such splits will not suffice on their own to derail the negotiating…

The debate over Iran's potential agreement with the United States has spilled beyond the country's political class and into the religious establishments and street gatherings that…