Clinton's argument with Bernie Sanders about normalizing relations with Iran, explained

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Sanders's approach to Iran "breaks with the sober and responsible diplomatic approach that's been working for the United States," Sullivan charged on the call. "The proposal would not succeed, but it would cause very real consternation among our allies and partners."

Clinton press secretary Brian Fallon piled on with the observation that "Republicans would love to have a debate with someone who thinks we should move quickly to warmer relations with a major sponsor of terrorism like Iran."

What did Sanders say?
I think what we have got to do is move as aggressively as we can to normalize relations with Iran, understanding that Iran’s behavior in so many ways is something that we disagree with. Their support for terrorism and the anti-American rhetoric that we’re hearing from some of their leadership is something that is not acceptable.

On the other hand, the fact that we managed to reach an agreement, something that I very strongly supported, that prevents Iran from getting a nuclear weapon, and that we did that without going to war, and that I believe we’re seeing a thaw in our relationships with Iran is a very positive step. So if your question is, do I want to see that relationship become more positive in the future? Yes.

Can I tell you that we should open an embassy in Tehran tomorrow? No, I don’t think we should. But I think the goal has got to be, as we have done with Cuba, to move in warm relations with a very powerful and important country in this world.

Why is Clinton criticizing this?

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http://www.vox.com/2016/1/22/10814158/clinton-sanders-iran-normalize