Hardline propagandist Mohammad Hassan Rajabi Davani, in a state TV appearance that subsequently went viral, likened former President Hassan Rouhani and former top nuclear negotiator Mohammad-Javad Zarif to two historical figures who betrayed early leaders of imams of the Shi'ite community.
The anchor in the televised segmented added his own criticisms. Deemed by some observers as potentially life-threatening, the incendiary remarks were met with swift criticism.
Reformist groups issued a manifesto last week calling for direct talks with Washington and suspension of uranium enrichment to defuse a nuclear standoff, while Rouhani and Zarif have also publicly urged diplomacy.
"Radicalism is contagious and can spread from one political front to another," Conservative commentator Nasser Imani said.
Two conservative dailies harshly criticized state television for the segement.
"While Israel believes its war against Iran is ongoing and seeks to exploit internal discord to bring Iranians into the streets and facilitate societal collapse, leveling accusations against political figures is tantamount to playing into Israel’s hands," the Farhikhtegan newspaper wrote.