no one who allows iran to become a nuclear power should consider running. so joining us now from london nbc s ally arusi. while political contenders back here in the states are using this iran deal as a true litmus test explain the developments we know from iran itself and the negotiations. well thomas there s nothing more the ruling clerics enjoy in iran than a bit of america bashing. the top man in the country, the supreme leader said this is a sign of decay of political ethics in america. he said he was very worried about a deal with the united states because they have a track record of being opaque deceitful, and back stabbing. it s also drawn a lot of criticism from america s partners. the legislative branch has been accused of meddling rather than trying to mediate in these negotiations, which is an accolade which is usually reserved for the hardliners in tehran. it s also damaged america s credibility with its partners whom they ve been trying to