The video, which surfaced Monday, shows Foreign Minister Mohammad Javad Zarif and hard-line lawmaker Mahdi Kouchakzadeh in a heated exchange, apparently during a closed session of parliament.

The hard-liner calls Zarif a “traitor,” claiming he speaks for Supreme Leader Ayatollah Ali Khamenei, which then prompts an angry reaction from the minister.

There are speculations that the poor-quality footage was filmed and leaked by one of the lawmakers present at the session. Several lawmakers have demanded that authorities uncover the person behind the leak and prosecute the individual.

Iran and six world powers are negotiating a final deal over its nuclear program. They face a June 30 deadline.