After Iran and the six world powers announced a framework that would drastically reduce Iran’s nuclear program, negotiators arrived home from the marathon talks in Lausanne, Switzerland, and immediately began selling the deal to their domestic critics. Iranian Foreign Minister Mohammad Javad Zarif gave a two-hour interview with state TV to defend the deal. The stiffest opposition so far has come from parliament.

According to a number of Iranian websites, Zarif’s address to parliament’s National Security and Foreign Policy Committee about the nuclear talks and the framework deal turned into an “unprecedented” argument between Zarif and conservative parliament member Javad Karimi-Ghodousi.

Karimi-Ghodousi said that the supreme leader, Ayatollah Ali Khamenei, had warned Zarif about deals regarding nuclear enrichment plants Fordow and Natanz. According to the Joint Comprehensive Plan of Action, Iran will not enrich at Fordow and use it as a research center.

Zarif denied that Khamenei had ever “warned” him, and that Karimi-Ghoudousi “was lying” and was not present at the meeting he was talking about. According to witnesses, the argument in the session became so intense that security officers kicked out the reporters.