TEHRAN — Having successfully suppressed the opposition uprising that followed last summer’s disputed presidential election, President Mahmoud Ahmadinejad and his supporters are now renewing their efforts to marginalize another rival group — Iran’s traditional conservatives.

Conservative rivals of Mr. Ahmadinejad are fighting back, publicly accusing him of sidelining clerics and the Parliament, pursuing an “extremist” ideology, and scheming to consolidate control over all branches of Iran’s political system.

“Now that they think they have ejected the reformists, maybe they think it is time to remove their principalist opponents,” said Morteza Nabavi, the editor of a mainstream conservative newspaper, in an unusually blunt interview published Friday in the weekly Panjereh. Iranian conservatives, including Mr. Ahmadinejad’s group, prefer the term “principalism” to “fundamentalism.”

The strikes that broke out in the Tehran bazaar last week, while provoked by a proposed income tax increase, reflect the growing rift between the conservative factions, with the merchants, or bazaaris, on the side of the traditionalists.